Fix filename test.txt

Soft masks are only allowed to be of colorspace DeviceGray so we
shouldn't use pngquant on them. For now, avoid this exceptional
case by excluded soft masks from optimization.

.coveragerc

@@ -0,0 +1,16 @@
+# Coverage isn't really compatible with subprocesses so results are unreliable
+
+[run]
+branch = True
+#concurrency = multiprocessing
+source = ocrmypdf/
+
+[report]
+exclude_lines =
+	pragma: no cover
+	def __repr__
+	raise AssertionError
+	raise NotImplementedError
+	if 0:
+	if False:
+	if __name__ == .__main__.:

.docker/Dockerfile

@@ -0,0 +1,72 @@
+# OCRmyPDF
+#
+FROM      ubuntu:18.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  build-essential autoconf automake libtool \
+  libleptonica-dev \
+  zlib1g-dev \
+  libexempi3 \
+  ocrmypdf \
+  pngquant \
+  python3-pip \
+  python3-venv \
+  tesseract-ocr \
+  tesseract-ocr-chi-sim \
+  tesseract-ocr-deu \
+  tesseract-ocr-eng \
+  tesseract-ocr-fra \
+  tesseract-ocr-por \
+  tesseract-ocr-spa \
+  unpaper \
+  wget
+
+
+ENV LANG=C.UTF-8
+
+# Compile and install jbig2
+# Needs libleptonica-dev, zlib1g-dev
+RUN \
+  mkdir jbig2 \
+  && wget -q https://github.com/agl/jbig2enc/archive/0.29.tar.gz -O - | \
+      tar xz -C jbig2 --strip-components=1 \
+  && cd jbig2 \
+  && ./autogen.sh && ./configure && make && make install \
+  && cd .. \
+  && rm -rf jbig2
+
+RUN apt-get remove -y autoconf automake libtool
+
+RUN python3 -m venv --system-site-packages /appenv
+
+# This installs the latest binary wheel instead of the code in the current
+# folder. Installing from source will fail, apparently because cffi needs
+# build-essentials (gcc) to do a source installation
+# (i.e. "pip install ."). It's unclear to me why this is the case.
+RUN . /appenv/bin/activate; \
+  pip install --upgrade pip \
+  && pip install --upgrade ocrmypdf
+
+# Now copy the application in, mainly to get the test suite.
+# Do this now to make the best use of Docker cache.
+COPY . /application
+RUN . /appenv/bin/activate; \
+  pip install -r /application/requirements/test.txt
+
+# Remove the junk, including the source version of application since it was
+# already installed
+RUN rm -rf /tmp/* /var/tmp/* /root/* /application/ocrmypdf \
+  && apt-get remove -y build-essential \
+  && apt-get autoremove -y \
+  && apt-get autoclean -y
+
+RUN useradd docker \
+  && mkdir /home/docker \
+  && chown docker:docker /home/docker
+
+USER docker
+WORKDIR /home/docker
+
+# Must use array form of ENTRYPOINT
+# Non-array form does not append other arguments, because that is "intuitive"
+ENTRYPOINT ["/application/.docker/docker-wrapper.sh"]

.docker/Dockerfile.polyglot

@@ -0,0 +1,17 @@
+# OCRmyPDF polyglot
+#
+FROM      jbarlow83/ocrmypdf:latest
+
+USER root
+
+# Update system and install our dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  tesseract-ocr-all 
+
+RUN apt-get autoremove -y && apt-get clean -y
+
+USER docker
+
+# Must use array form of ENTRYPOINT
+# Non-array form does not append other arguments, because that is "intuitive"
+ENTRYPOINT ["/application/.docker/docker-wrapper.sh"]

.dockerignore

@@ -1,21 +1,25 @@
+*.ipynb
+*.pdf
+*.pyc
+*.rst
+*.sublime*
+**/*.pyc
+.*/
+!.docker/
+.ruffus_history.sqlite
 bin/
 build/
+docs/
 dist/
+htmlcov/
 include/
 lib/
+MANIFEST.in
 ocrmypdf.egg-info/
 staging/
-.git/
-.ruffus_history.sqlite
-MANIFEST.in
-*.sublime*
-*.pdf
-*.rst
-*.pyc
-*/*.pyc
-*/*/*.pyc
-*/*/*/*.pyc
-*/*/*/*/*.pyc
-*/*/*/*/*/*.pyc
-*/*/*/*/*/*/*.pyc
-*/*/*/*/*/*/*/*.pyc
+tests/cache/
+tests/output/
+tests/resources/private/
+tmp/
+venv*/
+wheelhouse/

.git_archival.txt

@@ -0,0 +1 @@
+ref-names: $Format:%D$

.gitattributes

@@ -5,4 +5,9 @@
 # (binary is a macro for -text -diff)
 *.jar	binary
 *.pdf	binary
-*.PDF	binary
+*.PDF	binary
+*.png	binary
+*.jpg	binary
+*.bin   binary
+
+.git_archival.txt  export-subst

.github/ISSUE_TEMPLATE

@@ -0,0 +1,5 @@
+Please include the command line and a test file with your issue report.
+
+If possible, please use a test file that we can include in future test cases (no personal information, no copyrighted material).
+
+If you wish to encrypt a test file for the OCRmyPDF maintainer only, see the [Wiki](https://github.com/jbarlow83/OCRmyPDF/wiki).

.gitignore

@@ -1,23 +1,40 @@
-tmp/
-log/
-*.pyc
-tests/output/
+# Development environment
+.bash_history
+.pylintrc
+.pytest_cache/
 .ruffus_history.sqlite
+.venv/
+*.pyc
 *.sublime-*
-/*.pdf
+
+# Package building
+.eggs/
+*.egg-info/
 build/
 dist/
-*.egg-info/
-venv/
-venv-3.4/
-venv-3.5/
-*/test/output
-bin/
-include/
-lib/
-pip-selfcheck.json
-pyvenv.cfg
-htmlcov/
+wheelhouse/
+
+# Automatically generated files
+docs/_build/
+docs/_static/
+docs/_templates/
+docs/Makefile
+ocrmypdf/lib/_*.py
+
+# Code coverage
 .coverage
-.cache/
+htmlcov/
+
+# Testing
 .ipynb_checkpoints/
+.vscode/
+*.ipynb
+*.profile
+/*.pdf
+/*.qdf
+/scratch.py
+IDEAS
+log/
+tests/output/
+tests/resources/private/
+tmp/

.travis.yml

@@ -1,41 +1,118 @@
-language: python
-
 cache:
-    directories:
-        - $HOME/.cache/pip
-        - $HOME/.ccache
-        - tarballs
+  pip: true
+  directories:
+  - $HOME/Library/Caches/Homebrew
 
-python:
-    - 3.4
+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      sudo: required
+      language: python
+      python: "3.5"
+      env:
+        - DIST=trusty
+      addons: &trusty_apt
+        apt:
+          update: true
+          sources:
+          - sourceline: 'ppa:alex-p/tesseract-ocr'
+          - sourceline: 'ppa:heyarje/libav-11'
+          - sourceline: 'ppa:vshn/ghostscript'
+          packages:
+          - ghostscript
+          - libavcodec56
+          - libavformat56
+          - libavutil54
+          - libexempi3
+          - libffi-dev
+          - pngquant
+          - poppler-utils
+          - qpdf
+          - tesseract-ocr
+          - tesseract-ocr-deu
+          - tesseract-ocr-eng
+          - tesseract-ocr-fra
+    - os: linux
+      dist: trusty
+      sudo: required
+      language: python
+      python: "3.6"
+      env:
+        - DIST=trusty
+      addons: *trusty_apt
+    - os: linux
+      dist: xenial
+      sudo: required
+      language: python
+      python: "3.7"
+      env:
+        - DIST=xenial
+      addons:
+        apt:
+          update: true
+          sources:
+          - sourceline: 'ppa:alex-p/tesseract-ocr'
+          packages:
+          - ghostscript
+          - libexempi3
+          - libffi-dev
+          - pngquant
+          - poppler-utils
+          - qpdf
+          - tesseract-ocr
+          - tesseract-ocr-deu
+          - tesseract-ocr-eng
+          - tesseract-ocr-fra
+          - unpaper
+    - os: osx
+      osx_image: xcode9.2
+      language: generic
 
-before_install:
-    # Ubuntu packages
-    - sudo add-apt-repository ppa:evl.ms/precise -y  # for Ghostscript 9.15
-    - sudo add-apt-repository ppa:lyrasis/precise-backports -y  # for Tesseract 3.03
-    - sudo add-apt-repository ppa:b-eltzner/qpdfview-exp -y  # for QPDF 5
-    - sudo add-apt-repository ppa:itachi-san/ffmpeg -y  # for libav 11.2 (for unpaper)
-    - sudo apt-get update -qq  # must go after all add-apt-repo
-    - sudo apt-get install -y ghostscript tesseract-ocr tesseract-ocr-deu tesseract-ocr-eng tesseract-ocr-fra qpdf poppler-utils gcc libavformat-dev libavcodec-dev libavutil-dev automake make pkg-config xsltproc 
+before_cache:
+- rm -f $HOME/.cache/pip/log/debug.log
 
-    # pip
-    - pip install --upgrade pip
-
-    # Download, make and install unpaper (using ccache)
-    - mkdir -p tarballs
-    - "[ -f tarballs/unpaper-6.1.tar.xz ] || wget -q https://www.flameeyes.eu/files/unpaper-6.1.tar.xz -O tarballs/unpaper-6.1.tar.xz"
-    - tar -xvf tarballs/unpaper-6.1.tar.xz
-    - export PATH="/usr/lib/ccache:$PATH"
-    - pushd unpaper-6.1 && ./configure --prefix=/usr && make -j && sudo make install && popd
+before_install: |
+  mkdir -p bin
+  if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+    pip3 install --upgrade pip
+    pip3 install --upgrade wheel
+    if [[ "$DIST" == "trusty" ]]; then
+      mkdir -p packages
+      wget -q 'https://www.dropbox.com/s/vaq0kbwi6e6au80/unpaper_6.1-1.deb?raw=1' -O packages/unpaper_6.1-1.deb
+      sudo dpkg -i packages/unpaper_6.1-1.deb
+    fi
+  elif [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+    brew update --quiet && brew bundle --file=.travis/Brewfile --quiet
+    pip3 install --upgrade pip
+    pip3 install wheel
+  fi
 
 install:
-    - pip install -r requirements.txt
-    - pip install -r test_requirements.txt
+- export PATH=$PWD/bin:$PATH
+- pip3 install pycparser  # py3.7 workaround for https://github.com/eliben/pycparser/issues/251
+- pip3 install -r requirements/main.txt
+- pip3 install --no-deps .
+- pip3 install -r requirements/test.txt
 
 script:
-    - python setup.py clean
-    - python setup.py install
-    - py.test
+- tesseract --version
+- qpdf --version
+- pytest -n auto
 
-os:
-    - linux
+deploy:
+  # release for main pypi
+  # 3.6 is considered the build leader and does the deploy, otherwise there is
+  # a race and all versions will try to deploy
+  # OTOH if we ever need separate binary wheels then each version needs its
+  # own deploy
+- provider: pypi
+  user: ocrmypdf-travis
+  password:
+    secure: "DTFOmmNL6olA0+yXvp4u9jXZlZeqrJsJ0526jzqf4a3gZ6jnGTq5UI6WzRsslSyoMMfXKtHQebqHM6ogSgCZinyZ3ufHJo8fn9brxbEc2gsiWkbj5o3bGwdWMT1vNNE7XW0VCpw87rZ1EEwjl4FJHFudMlPR1yfU5+uq0k0PACo="
+  distributions: "sdist bdist_wheel"
+  on:
+    branch: master
+    tags: true
+    condition: $TRAVIS_PYTHON_VERSION == "3.6" && $TRAVIS_OS_NAME == "linux"
+  skip_upload_docs: true

.travis/Brewfile

@@ -0,0 +1,11 @@
+brew 'python'
+
+brew 'exempi'
+brew 'ghostscript'
+brew 'jbig2enc'
+brew 'leptonica'
+brew 'openjpeg'
+brew 'pngquant'
+brew 'qpdf'
+brew 'tesseract'
+brew 'unpaper'

Dockerfile

@@ -1,88 +0,0 @@
-# OCRmyPDF
-#
-# VERSION               3.0.0
-FROM      debian:stretch
-MAINTAINER James R. Barlow <jim@purplerock.ca>
-
-# Add unprivileged user
-RUN useradd docker \
-  && mkdir /home/docker \
-  && chown docker:docker /home/docker
-
-# Update system and install our dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-  locales \
-  ghostscript \
-  tesseract-ocr \
-  tesseract-ocr-deu tesseract-ocr-spa tesseract-ocr-eng tesseract-ocr-fra \
-  qpdf \
-  poppler-utils \
-  python3 \
-  python3-pip \
-  python3-venv \
-  python3-reportlab \
-  python3-pil
-
-# Enforce UTF-8
-# Borrowed from https://index.docker.io/u/crosbymichael/python/ 
-RUN dpkg-reconfigure locales && \
-  locale-gen C.UTF-8 && \
-  /usr/sbin/update-locale LANG=C.UTF-8
-ENV LC_ALL C.UTF-8
-
-# Build unpaper 6.1
-RUN apt-get install -y \
-  wget \
-  gcc \
-  libavformat-dev \
-  libavcodec-dev \
-  libavutil-dev \
-  autoconf \
-  automake \
-  make \
-  pkg-config \
-  xsltproc
-
-WORKDIR /root
-RUN wget -q https://github.com/Flameeyes/unpaper/archive/unpaper-6.1.tar.gz
-RUN tar xf unpaper-6.1.tar.gz
-WORKDIR /root/unpaper-unpaper-6.1
-RUN autoreconf -i
-RUN ./configure CFLAGS="-O2 -march=native -pipe -flto"
-RUN make -j install
-WORKDIR /
-
-RUN apt-get remove -y \
-  gcc \
-  autoconf \
-  automake \
-  pkg-config \
-  xsltproc \
-  make
-RUN apt-get autoremove -y && apt-get clean -y
-RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /root/*
-
-# Set up a Python virtualenv and take all of the system packages, so we can
-# rely on the platform packages rather than importing GCC and compiling them
-RUN pyvenv /appenv \
-  && pyvenv --system-site-packages /appenv
-
-COPY . /application/
-
-# Install application and dependencies
-# In this arrangement Pillow and reportlab will be provided by the system
-RUN . /appenv/bin/activate; \
-  pip install --upgrade pip \
-  && pip install --no-cache-dir /application \
-  && pip install --no-cache-dir -r /application/test_requirements.txt
-
-USER docker
-WORKDIR /home/docker
-
-ENV DEFAULT_RUFFUS_HISTORY_FILE=/tmp/.{basename}.ruffus_history.sqlite
-ENV OCRMYPDF_TEST_OUTPUT=/tmp/test-output
-ENV OCRMYPDF_IN_DOCKER=1
-
-# Must use array form of ENTRYPOINT
-# Non-array form does not append other arguments, because that is "intuitive"
-ENTRYPOINT ["/application/docker-wrapper.sh"]

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
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+giving you legal permission to copy, distribute and/or modify it.
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+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
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+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
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+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSE.rst

@@ -1,20 +0,0 @@
-Copyright (c) 2013-2015, The OCRmyPDF Authors
-
-Permission is hereby granted, free of charge, to any person obtaining a
-copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

MANIFEST.in

@@ -1,3 +1,43 @@
-recursive-exclude tests/output *
-include requirements.txt
-include test_requirements.txt
+# requirements
+recursive-include requirements *
+
+# git
+include .git_archival.txt
+
+# docker
+include .dockerignore
+recursive-include .docker *
+
+# tests
+include .coveragerc
+recursive-include tests *.bin
+recursive-include tests *.jpg
+recursive-include tests *.jsonl
+recursive-include tests *.png
+recursive-include tests *.pdf
+recursive-include tests *.py
+recursive-include tests *.rst
+recursive-include tests *.txt
+recursive-exclude tests/resources/private *
+
+# documentation
+include LICENSE
+include *.rst
+recursive-exclude .github *
+recursive-include docs *.py
+recursive-include docs *.rst
+recursive-include docs *.svg
+recursive-exclude docs/_build *
+
+
+# support files
+recursive-include src/ocrmypdf/data *
+include *.py
+exclude tasks.py
+recursive-exclude .travis *
+exclude .travis*
+
+
+# code
+exclude src/ocrmypdf/lib/_leptonica.py
+exclude scratch.py

OCRmyPDF.sh

@@ -1,6 +0,0 @@
-#!/bin/sh
-##############################################################################
-# Copyright (c) 2013-14: fritz-hh from Github (https://github.com/fritz-hh)
-##############################################################################
-
-python3 -m ocrmypdf.main "$@"

README.md

@@ -0,0 +1,132 @@
+OCRmyPDF
+========
+
+![image](https://travis-ci.org/jbarlow83/OCRmyPDF.svg?branch=master%0A%20:target:%20https://travis-ci.org/jbarlow83/OCRmyPDF)
+
+![image](https://img.shields.io/pypi/v/ocrmypdf.svg%0A%20:target:%20https://pypi.org/project/ocrmypdf/)
+
+![image](https://img.shields.io/homebrew/v/ocrmypdf.svg%0A%20:alt:%20homebrew%0A%20:target:%20http://brewformulas.org/Ocrmypdf)
+
+OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched or copy-pasted.
+
+```bash
+ocrmypdf                      # it's a scriptable command line program
+   -l eng+fra                 # it supports multiple languages
+   --rotate-pages             # it can fix pages that are misrotated
+   --deskew                   # it can deskew crooked PDFs!
+   --title "My PDF"           # it can change output metadata
+   --jobs 4                   # it uses multiple cores by default
+   --output-type pdfa         # it produces PDF/A by default
+   input_scanned.pdf          # takes PDF input (or images)
+   output_searchable.pdf      # produces validated PDF output
+```
+
+Main features
+-------------
+
+-   Generates a searchable [PDF/A](https://en.wikipedia.org/?title=PDF/A) file from a regular PDF
+-   Places OCR text accurately below the image to ease copy / paste
+-   Keeps the exact resolution of the original embedded images
+-   When possible, inserts OCR information as a "lossless" operation without disrupting any other content
+-   Optimizes PDF images, often producing files smaller than the input file
+-   If requested deskews and/or cleans the image before performing OCR
+-   Validates input and output files
+-   Distributes work across all available CPU cores
+-   Uses [Tesseract OCR](https://github.com/tesseract-ocr/tesseract) engine
+-   Supports more than [100 languages](https://github.com/tesseract-ocr/tessdata) recognized by Tesseract
+-   Battle-tested on thousands of PDFs, a test suite and continuous integration
+
+For details: please consult the [documentation](https://ocrmypdf.readthedocs.io/en/latest/).
+
+Motivation
+----------
+
+I searched the web for a free command line tool to OCR PDF files on Linux/UNIX: I found many, but none of them were really satisfying.
+
+-   Either they produced PDF files with misplaced text under the image (making copy/paste impossible)
+-   Or they did not handle accents and multilingual characters
+-   Or they changed the resolution of the embedded images
+-   Or they generated ridiculously large PDF files
+-   Or they crashed when trying to OCR
+-   Or they did not produce valid PDF files
+-   On top of that none of them produced PDF/A files (format dedicated for long time storage)
+
+...so I decided to develop my own tool.
+
+Installation
+------------
+
+Linux, UNIX, and macOS are supported. Windows is not directly supported but there is a Docker image available that runs on Windows.
+
+Users of Debian 9 or later or Ubuntu 16.10 or later may simply
+
+```bash
+apt-get install ocrmypdf
+```
+
+and macOS users with Homebrew may simply
+
+```bash
+brew install ocrmypdf
+```
+
+For everyone else, [see our documentation](https://ocrmypdf.readthedocs.io/en/latest/installation.html) for installation steps.
+
+Languages
+---------
+
+OCRmyPDF uses Tesseract for OCR, and relies on its language packs. For Linux users, you can often find packages that provide language packs:
+
+```bash
+# Display a list of all Tesseract language packs
+apt-cache search tesseract-ocr
+
+# Debian/Ubuntu users
+apt-get install tesseract-ocr-chi-sim  # Example: Install Chinese Simplified language back
+```
+
+You can then pass the `-l LANG` argument to OCRmyPDF to give a hint as to what languages it should search for. Multiple languages can be requested.
+
+Documentation and support
+-------------------------
+
+Once ocrmypdf is installed, the built-in help which explains the command syntax and options can be accessed via:
+
+```bash
+ocrmypdf --help
+```
+
+Our [documentation is served on Read the Docs](https://ocrmypdf.readthedocs.io/en/latest/index.html).
+
+If you detect an issue, please:
+
+-   Check whether your issue is already known
+-   If no problem report exists on github, please create one here: <https://github.com/jbarlow83/OCRmyPDF/issues>
+-   Describe your problem thoroughly
+-   Append the console output of the script when running the debug mode (`-v 1` option)
+-   If possible provide your input PDF file as well as the content of the temporary folder (using a file sharing service like Dropbox)
+
+Requirements
+------------
+
+Runs on CPython 3.5, 3.6 and 3.7. Requires external program installations of Ghostscript, Tesseract OCR, QPDF, and Leptonica. ocrmypdf is pure Python, but uses CFFI to portably generate library bindings.
+
+Press & Media
+-------------
+
+-   [c't 1-2014, page 59](http://heise.de/-2279695): Detailed presentation of OCRmyPDF v1.0 in the leading German IT magazine c't
+-   [heise Open Source, 09/2014: Texterkennung mit OCRmyPDF](http://heise.de/-2356670)
+
+License
+-------
+
+The OCRmyPDF software is licensed under the GNU GPLv3. Certain files are covered by other licenses, as noted in their source files.
+
+The license for each test file varies, and is noted in tests/resources/README.rst. The documentation is licensed under Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA 4.0).
+
+OCRmyPDF versions prior to 6.0 were licensed under the MIT License.
+
+Disclaimer
+----------
+
+The software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

README.rst

@@ -1,260 +0,0 @@
-OCRmyPDF
-========
-
-OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to
-be searched.
-
-Main features
--------------
-
--  Generates a searchable
-   `PDF/A <https://en.wikipedia.org/?title=PDF/A>`__ file from a regular PDF
-   only containing images
--  Places OCR text accurately below the image to ease copy / paste
--  Keeps the exact resolution of the original embedded images
-
-   -  or if requested oversamples the images before OCRing so as to get
-      better results
-
--  When possible, copies input images directly to output without transcoding,
-   to preserve image quality
--  Keeps file size about the same
--  If requested deskews and/or cleans the image before performing OCR
--  Validates input and output files
--  Provides debug mode to enable easy verification of the OCR results
--  Processes pages in parallel when more than one CPU core is
-   available
--  Uses `Tesseract OCR <https://github.com/tesseract-ocr/tesseract>`__ engine
--  Supports the `39 languages <https://code.google.com/p/tesseract-ocr/downloads/list>`__ recognized by Tesseract
--  Battle-tested on thousands of PDFs, a test suite and continuous integration
-
-For details: please consult the `release notes <RELEASE_NOTES.rst>`__.
-
-Motivation
-----------
-
-I searched the web for a free command line tool to OCR PDF files on
-Linux/UNIX: I found many, but none of them were really satisfying.
-
--  Either they produced PDF files with misplaced text under the image (making copy/paste impossible) 
--  Or they did not display correctly some escaped HTML characters located in the hOCR file produced by the OCR engine 
--  Or they changed the resolution of the embedded images
--  Or they generated PDF files having a ridiculous big size
--  Or they crashed when trying to OCR some of my PDF files
--  Or they did not produce valid PDF files (even though they were readable with my current PDF reader)
--  On top of that none of them produced PDF/A files (format dedicated for long time storage)
-
-... so I decided to develop my own tool (using various existing scripts
-as an inspiration)
-
-Installation
-------------
-
-Download OCRmyPDF here: https://github.com/jbarlow83/OCRmyPDF/releases
-
-You can install it to a Python virtual environment or system-wide. 
-
-Installing the Docker container
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-For many users, installing the Docker container will be easier than installing all of OCRmyPDF's dependencies. For Windows, it is the only option.
-
-If you have `Docker <https://docs.docker.com/>`__ installed on your system, you can install
-a Docker container of the latest release.
-
-Follow the Docker installation instructions for your platform.  If you can run this command
-successfully, your system is ready to download and execute the image::
-
-   docker run hello-world
-   
-OCRmyPDF will use all available CPU cores.  By default, the VirtualBox machine instance on Windows and OS X has only a single CPU core enabled. Use the VirtualBox Manager to determine the name of your Docker container host, and then follow these optional steps to enable multiple CPUs::
-
-   # Optional
-   docker-machine stop "yourVM"
-   VBoxManage modifyvm "yourVM" --cpus 2  # or whatever number of core is desired
-   docker-machine start "yourVM"
-   eval $(docker-machine env "yourVM")
-
-Assuming you have a Docker engine running somewhere, you can run these commands to download
-the image::
-
-   docker pull jbarlow83/ocrmypdf
-
-Then tag it to give a more convenient name, just ocrmypdf::
-
-   docker tag jbarlow83/ocrmypdf ocrmypdf
-  
-You can then run using the command::
-
-   docker run ocrmypdf --help
-  
-To execute the OCRmyPDF on a local file, you must `provide a writable volume to the Docker image <https://docs.docker.com/userguide/dockervolumes/>`__, such as this in this template::
-
-   docker run -v "$(pwd):/home/docker" <other docker arguments>   ocrmypdf <your arguments to ocrmypdf>
-
-In this worked example, the current working directory contains an input file called ``test.pdf`` and the output will go to ``output.pdf``:: 
-
-   docker run -v "$(pwd):/home/docker"   ocrmypdf --skip-text test.pdf output.pdf
-
-Note that ``ocrmypdf`` has its own separate ``-v VERBOSITYLEVEL`` argument to control debug verbosity. All Docker arguments should before the ``ocrmypdf`` container name and all arguments to ``ocrmypdf`` should be listed after.
-
-Installing on Mac OS X
-~~~~~~~~~~~~~~~~~~~~~~
-
-These instructions probably work on all Mac OS X versions later than 10.7 (Lion). OCRmyPDF is known to work on Yosemite and El Capitan, and regularly tested on El Capitan.
-
-If it's not already present, `install Homebrew <http://brew.sh/>`__.
-
-Update Homebrew::
-
-   brew update
-   
-Install or upgrade the required Homebrew packages, if any are missing::
-
-   brew install libpng openjpeg jbig2dec     # image libraries
-   brew install qpdf
-   brew install ghostscript
-   brew install python3
-   brew install libxml2
-   brew install leptonica
-   brew install tesseract
-   
-It is also recommended that install Pillow and confirm it can read and write JPEG and PNG files::
-
-   pip3 install --upgrade pip
-   pip3 install --upgrade pillow
-
-Sometimes, the Python imaging library (Pillow) can end up being compiled and installed without support for JPEG and PNG files. (Arguably, this is an unfixed bug in Pillow's installer.) To confirm that Pillow is compiled correctly and can access JPEG and PNG files, try this command::
-
-   python3 -c "from PIL import Image; im = Image.new('1', (1, 1)); im.save('test.png'); im.save('test.jpg')"
-
-If you have trouble getting Pillow to access JPEG and PNG files, `review the installation instructions <https://pillow.readthedocs.org/installation.html>`__.
-
-You can then install OCRmyPDF from PyPI::
-
-   pip3 install ocrmypdf
-
-The command line program should now be available::
-
-   ocrmypdf --help
-
-Installing on Ubuntu 14.04 LTS
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Installing on Ubuntu 14.04 LTS (trusty) is more difficult than other options, because of certain bugs in Python package installation.
-
-Update apt-get::
-
-   sudo apt-get update
-   sudo apt-get upgrade
-   
-Install system dependencies::
-
-   sudo apt-get install \
-      zlib1g-dev \
-      libjpeg-dev \
-      ghostscript \
-      tesseract-ocr \
-      qpdf \
-      unpaper \
-      python3-pip \
-      python3-pil \
-      python3-pytest \
-      python3-reportlab
-
-If you wish install OCRmyPDF to the system Python, then install as follows (note this installs new packages
-into your system Python, which could interfere with other programs)::
-
-   sudo pip3 install ocrmypdf
-   
-If you wish to install OCRmyPDF to a virtual environment to isolate system Python from modified, you can
-follow these steps.  This includes a workaround `for a known, unresolved issue in Ubuntu 14.04's ensurepip
-package <http://www.thefourtheye.in/2014/12/Python-venv-problem-with-ensurepip-in-Ubuntu.html>`__::
-
-   sudo apt-get install python3-venv
-   python3 -m venv venv-ocrmypdf --without-pip
-   source venv-ocrmypdf/bin/activate
-   wget -O - -o /dev/null https://bootstrap.pypa.io/get-pip.py | python
-   deactivate
-   pyvenv --system-site-packages venv-ocrmypdf
-   source venv-ocrmypdf/bin/activate
-   pip install ocrmypdf
-
-Ubuntu 14.04 only installs ``unpaper`` version 0.4.2, which is not supported by OCRmyPDF because it is produces invalid output. This program is an optional dependency, and provides page deskewing and cleaning. See `Dockerfile <Dockerfile>`__ for an example of how to building unpaper 6.1 from source. If you choose to install unpaper later, OCRmyPDF will use the foremost version on the system PATH.
-
-      
-Installing HEAD revision from sources
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-If you have ``git`` and ``python3.4`` or ``python3.5`` installed, you can install from source. When the ``pip`` installer runs,
-it will alert you if dependencies are missing.
-
-First, clone the HEAD revision::
-
-   git clone -b master https://github.com/jbarlow83/OCRmyPDF.git
-   cd OCRmyPDF
-
-To install the HEAD revision from sources::
-
-   pip3 install .
-
-Or, to install in `development mode <https://pythonhosted.org/setuptools/setuptools.html#development-mode>`__, 
-allowing customization of OCRmyPDF, use the ``-e`` flag::
-
-   pip3 install -e .
-   
-On certain Linux distributions such as Ubuntu, you may need to use 
-run the install command as superuser::
-
-   sudo pip3 install [-e] .
-   
-Note that this will alter your system's Python distribution. If you prefer 
-to not install as superuser, you can install the package in a Python virtual environment::
-
-   git clone -b master https://github.com/jbarlow83/OCRmyPDF.git
-   pyvenv venv
-   source venv/bin/activate
-   cd OCRmyPDF
-   pip3 install .
-
-However, ``ocrmypdf`` will only be accessible on the system PATH after
-you activate the virtual environment.
-
-To run the program::
-   
-   ocrmypdf --help
-
-If not yet installed, the script will notify you about dependencies that
-need to be installed. The script requires specific versions of the
-dependencies. Older version than the ones mentioned in the release notes
-are likely not to be compatible to OCRmyPDF.
-
-Support
--------
-
-In case you detect an issue, please:
-
--  Check if your issue is already known
--  If no problem report exists on github, please create one here:
-   https://github.com/jbarlow83/OCRmyPDF/issues
--  Describe your problem thoroughly
--  Append the console output of the script when running the debug mode
-   (``-v 1`` option)
--  If possible provide your input PDF file as well as the content of the
-   temporary folder (using a file sharing service like
-   www.file-upload.net)
-
-Press & Media
--------------
-
--  `c't 1-2014, page 59 <http://www.heise.de/ct/inhalt/2014/1/58/>`__:
-   Detailed presentation of OCRmyPDF v1.0 in the leading German IT
-   magazine c't
--  `heise Open Source, 09/2014: Texterkennung mit
-   OCRmyPDF <http://www.heise.de/-2356670>`__
-
-Disclaimer
-----------
-
-The software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-CONDITIONS OF ANY KIND, either express or implied.

RELEASE_NOTES.rst

@@ -1,539 +0,0 @@
-RELEASE NOTES
-=============
-
-Please always read this file before installing the package
-
-Download software here: https://github.com/jbarlow83/OCRmyPDF/tags
-
-
-v3.1:
-=====
-
-Changes
--------
-
--  Default output format is now PDF/A-2b instead of PDF/A-1b
--  Python 3.5 and OS X El Capitan are now supported platforms - no changes were
-   needed to implement support
--  Improved some error messages related to missing input files
--  Fixed issue #20 - uppercase .PDF extension not accepted
--  Fixed an issue where OCRmyPDF failed to text that certain pages contained previously OCR'ed text, 
-   such as OCR text produced by Tesseract 3.04
--  Inserts /Creator tag into PDFs so that errors can be traced back to this project
--  Added new option --pdf-renderer=auto, to let OCRmyPDF pick the best PDF renderer. 
-   Currently it always chooses the 'hocrtransform' renderer but that behavior may change.
--  Set up Travis CI automatic integration testing
-
-v3.0:
-=====
-
-New features
-------------
-
--  Easier installation with a Docker container or Python's ``pip`` package manager 
--  Eliminated many external dependencies, so it's easier to setup
--  Now installs ``ocrmypdf`` to ``/usr/local/bin`` or equivalent for system-wide
-   access and easier typing
--  Improved command line syntax and usage help (``--help``)
--  Tesseract 3.03+ PDF page rendering can be used instead for better positioning
-   of recognized text (``--pdf-renderer tesseract``)
--  PDF metadata (title, author, keywords) are now transferred to the 
-   output PDF
--  PDF metadata can also be set from the command line (``--title``, etc.)
--  Automatic repairs malformed input PDFs if possible
--  Added test cases to confirm everything is working
--  Added option to skip extremely large pages that take too long to OCR and are 
-   often not OCRable (e.g. large scanned maps or diagrams); other pages are still
-   processed (``--skip-big``)
--  Added option to kill Tesseract OCR process if it seems to be taking too long on
-   a page, while still processing other pages (``--tesseract-timeout``)
--  Less common colorspaces (CMYK, palette) are now supported by conversion to RGB
--  Multiple images on the same PDF page are now supported
-
-Changes
--------
-
--  New, robust rewrite in Python 3.4+ with ruffus_ pipelines
--  Now uses Ghostscript 9.14's improved color conversion model to preserve PDF colors
--  OCR text is now rendered in the PDF as invisible text. Previous versions of OCRmyPDF
-   incorrectly rendered visible text with an image on top.
--  All "tasks" in the pipeline can be executed in parallel on any
-   available CPUs, increasing performance
--  The ``-o DPI`` argument has been phased out, in favor of ``--oversample DPI``, in
-   case we need ``-o OUTPUTFILE`` in the future
--  Removed several dependencies, so it's easier to install.  We no 
-   longer use:
-   
-   - GNU parallel_
-   - ImageMagick_
-   - Python 2.7
-   - Poppler
-   - MuPDF_ tools
-   - shell scripts
-   - Java and JHOVE_
-   - libxml2
-
--  Some new external dependencies are required or optional, compared to v2.x:
-
-   - Ghostscript 9.14+
-   - qpdf_ 5.0.0+
-   - Unpaper_ 6.1 (optional)
-   - some automatically managed Python packages
-  
-.. _ruffus: http://www.ruffus.org.uk/index.html
-.. _parallel: https://www.gnu.org/software/parallel/
-.. _ImageMagick: http://www.imagemagick.org/script/index.php
-.. _MuPDF: http://mupdf.com/docs/
-.. _qpdf: http://qpdf.sourceforge.net/
-.. _Unpaper: https://github.com/Flameeyes/unpaper
-.. _JHOVE: http://jhove.sourceforge.net/
-
-Release candidates
-------------------
-
--  rc9:
-
-   - fix issue #118: report error if ghostscript iccprofiles are missing
-   - fixed another issue related to #111: PDF rasterized to palette file
-   - add support image files with a palette
-   - don't try to validate PDF file after an exception occurs
-
--  rc8:
-
-   - fix issue #111: exception thrown if PDF is missing DocumentInfo dictionary
-
--  rc7:
-
-   - fix error when installing direct from pip, "no such file 'requirements.txt'"
-
--  rc6:
-
-   - dropped libxml2 (Python lxml) since Python 3's internal XML parser is sufficient
-   - set up Docker container
-   - fix Unicode errors if recognized text contains Unicode characters and system locale is not UTF-8
-
--  rc5:
-
-   - dropped Java and JHOVE in favour of qpdf
-   - improved command line error output
-   - additional tests and bug fixes
-   - tested on Ubuntu 14.04 LTS
-
--  rc4:
-
-   - dropped MuPDF in favour of qpdf
-   - fixed some installer issues and errors in installation instructions
-   - improve performance: run Ghostscript with multithreaded rendering
-   - improve performance: use multiple cores by default
-   - bug fix: checking for wrong exception on process timeout 
-
--  rc3: skipping version number intentionally to avoid confusion with Tesseract
--  rc2: first release for public testing to test-PyPI, Github
--  rc1: testing release process
-
-Compatibility notes
--------------------
-
--  ``./OCRmyPDF.sh`` script is still available for now
--  Stacking the verbosity option like ``-vvv`` is no longer supported
-
--  The configuration file ``config.sh`` has been removed.  Instead, you can
-   feed a file to the arguments for common settings:
-
-::
-
-   ocrmypdf input.pdf output.pdf @settings.txt
-
-where ``settings.txt`` contains *one argument per line*, for example:
-
-::
-
-   -l 
-   deu 
-   --author 
-   A. Merkel 
-   --pdf-renderer 
-   tesseract
-
-
-Fixes
------
-
--  Handling of filenames containing spaces: fixed
-
-Notes and known issues
-----------------------
-
--  Some dependencies may work with lower versions than tested, so try
-   overriding dependencies if they are "in the way" to see if they work.
-
--  ``--pdf-renderer tesseract`` will output files with an incorrect page size in Tesseract 3.03,
-   due to a bug in Tesseract.
-
--  PDF files containing "inline images" are not supported and won't be for the 3.0 release. Scanned
-   images almost never contain inline images.
-
-
-v2.2-stable (2014-09-29):
-=========================
-
-New features
-------------
-
-- None
-
-Changes
--------
-
-- Update to jhove v1.11
-- Request the python library reportlab v3.0 or newer (So that we could remove a patch to the previous version of reportlab leading to issues for some users)
-
-Fixes
------
-
-- Fix bug on Mac OS X (resolution of simlink to OCRmyPDF.sh script) (thanks to jbarlow83)
-- Check if the input pdf file exists before to continue
-
-Tested with
------------
-
-- Operating system: FreeBSD 9.2
-- Dependencies:
-
-   - parallel 20140822
-   - poppler-utils 0.24.5
-   - ImageMagick 6.8.9-4 2014-09-17
-   - Unpaper 0.3
-   - tesseract 3.02.02
-   - Python 2.7.8
-   - ghostcript (gs): 9.06
-   - java: openjdk version "1.7.0_65"
-
-
-v2.1-stable (2014-09-20):
-=========================
-
-New features
-------------
-
--  None
-
-Changes
--------
-
--  None
-
-Fixes
------
-
--  Allow execution via simlink
--  Add support for tesseract 3.03
--  Add support for newer version of reportlab
--  Lowered minimum version of gnu parallel
--  Various typo
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  parallel 20130222
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"
-
-v2.0-stable (2014-01-25):
-=========================
-
-New features
-------------
-
--  Check if the language(s) passed using the -l option is supported by
-   tesseract (fixes #60)
-
-Changes
--------
-
--  Allow OCRmyPDF to be used with tesseract 3.02.01, even though OCR
-   might fail for few PDF file (see issue #28). Rationale: For some
-   linux distribution, no newer version than tesseract 3.02.01 is
-   available
-
-Fixes
------
-
--  More robust algorithm for checking the version of the installed
-   tesseract package
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  parallel 20130222
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"
-
-v2.0-rc2 (2014-01-16):
-======================
-
-New features
-------------
-
--  None
-
-Changes
--------
-
--  Size reduction of final PDF file: (fixes #50)
--  Support for monochrome (Black&White) images (massive size reduction
-   in final PDF: >80%)
--  Reduced size of grayscale images (by 13% on test PDF file)
--  Preventing fi, fl ligatures does not require anymore to pass an
-   additional config file to tesseract using the -C option (fixes #58)
--  Location of temporary folder according to content of environment
-   variable TMPDIR.
--  Dependency to pdftk removed
--  Check for compatible versions of dependencies: (fixes #51)
--  parallel and tesseract
--  python libraries reportlab and lxml
-
-Fixes
------
-
--  Improved portability with various shells (dash, bash, tcsh) and OS
-   (FreeBSD, MAC OSX, Linux) (fixes #59)
--  Corrected bug in case the input PDF file contains a space character
-   (fixes #48)
--  Prevent spurious error message in case there is no image in a PDF
-   page
--  Prevent collision of temporary folder names (fixes #57)
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  parallel 20130222
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"
-
-v2.0-rc1 (2014-01-07):
-======================
-
-New features
-------------
-
--  Huge performance improvement on machines having multiple CPU/cores
-   (processing of several pages concurrently) (fixes #18)
--  By default prevent from processing a PDF file already containing
-   fonts (i.e. text)(it can be overridden with the -f flag) (fixes #16)
--  Warn if the resolution is too low to get reasonable OCR results
-   (fixes #37)
--  New option (-o) to perform automatic oversampling if the image
-   resolution is too low. This can improve OCR results.
--  Warn if using a tesseract version older than v3.02.02 (as older
-   versions are known to produce invalid output) (fixes #41)
--  Echo version of the installed dependencies (e.g. tesseract) in debug
-   mode in order to ease support (fixes #35)
--  Echo the arguments passed to the script in debug mode to ease support
-
-Changes
--------
-
--  In debug mode: The debug page is now placed after the respective
-   "normal" page
--  Reduced disk space usage in temporary folder if -d (deskew) or -c
-   (cleanup) options are not selected
--  New file src/config.sh containing various configuration parameters
--  Documentation of the tesseract config file "tess-cfg/no\_ligature"
-   improved
--  Improved consistency of the temporary file names
-
-Fixes
------
-
--  Improved robustness:
--  in case vertical resolution differs from horizontal resolution (fixes
-   #38)
--  in case a PDF page contains more than one image (fixes #36)
--  Fix a problem occurring if python 3 is the standard interpreter
-   (fixes #33)
--  Fix a problem occurring if the input PDF file contains special
-   characters like "#" (fixes #34)
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  parallel 20130222
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  pdftk 1.45
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"
-
-v1.1-stable (2014-01-06):
-=========================
-
-New features
-------------
-
--  N/A
-
-Changes
--------
-
--  N/A
-
-Fixes
------
-
--  Fixed syntax error (bashism) leading to an error message on certain
-   systems (fixes #42)
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  pdftk 1.45
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"
-
-v1.0-stable (2013-05-06):
-=========================
-
-New features
-------------
-
--  In debug mode: compute and echo time required for processing (fixes
-   #26)
-
-Changes
--------
-
--  Removed feature to add metadata in final pdf file (because it lead to
-   to final PDF file that does not comply to the PDF/A-1 format)
--  Removed feature to set same owner & permissions in final PDF file
-   than in input file
--  Removed many unused jhove files (e.g. documentation, \*.java and
-   \*.class files)
-
-Fixes
------
-
--  Correction to handle correctly path and input PDF files having spaces
-   (fixes #31)
--  Resolutions (x/y) that are nearly equal are now supported (fixes #25)
--  Fix compatibility issue with Ubuntu server 12.04 / Ubuntu server
-   10.04 / Linux Mint 13 Maya and probably other Linux distributions
-   (fixes #27)
--  Commit missing jhove files (\*.jar mainly) due to wrong .gitignore
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  pdftk 1.45
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"
-
-v1.0-rc2 (2013-04-29):
-======================
-
-New features
-------------
-
--  Keep temporary files if debug mode is set (fixes #22)
--  Set same owner & permissions in final PDF file than in input file
-   (fixes #9)
--  Added metadata in final pdf file (fixes #4)
-
-Changes
--------
-
--  N/A
-
-Fixes
------
-
--  Fixed wrong image cropping when deskew option is activated
--  Exit with error message if page size is not found in hocr file (fixes
-   #21)
--  Various minor fixes in log messages
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  pdftk 1.45
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"
-
-v1.0-rc1 (2013-04-26):
-======================
-
-New features
-------------
-
--  First release candidate
-
-Changes
--------
-
--  N/A
-
-Fixes
------
-
--  N/A
-
-Tested with
------------
-
--  Operating system: FreeBSD 9.1
--  Dependencies:
--  poppler-utils 0.22.2
--  ImageMagick 6.8.0-7 2013-03-30
--  Unpaper 0.3
--  tesseract 3.02.02
--  Python 2.7.3
--  pdftk 1.45
--  ghoscript (gs): 9.06
--  java: openjdk version "1.7.0\_17"

docs/advanced.rst

@@ -0,0 +1,191 @@
+Advanced features
+=================
+
+Control of OCR options
+----------------------
+
+OCRmyPDF provides many features to control the behavior of the OCR engine, Tesseract.
+
+When OCR is skipped
+"""""""""""""""""""
+
+If a page in a PDF seems to have text, by default OCRmyPDF will exit without modifying the PDF. This is to ensure that PDFs that were previously OCRed or were "born digital" rather than scanned are not processed.
+
+If ``--skip-text`` is issued, then no OCR will be performed on pages that already have text. The page will be copied to the output. This may be useful for documents that contain both "born digital" and scanned content, or to use OCRmyPDF to normalize and convert to PDF/A regardless of their contents.
+
+If ``--force-ocr`` is issued, then all pages will be rasterized to images, discarding any hidden OCR text, and rasterizing any printable text. This is useful for redoing OCR, for fixing OCR text with a damaged character map (text is selectable but not searchable), and destroying redacted information.
+
+
+Time and image size limits
+""""""""""""""""""""""""""
+
+By default, OCRmyPDF permits tesseract to run for three minutes (180 seconds) per page. This is usually more than enough time to find all text on a reasonably sized page with modern hardware.
+
+If a page is skipped, it will be inserted without OCR. If preprocessing was requested, the preprocessed image layer will be inserted.
+
+If you want to adjust the amount of time spent on OCR, change ``--tesseract-timeout``.  You can also automatically skip images that exceed a certain number of megapixels with ``--skip-big``. (A 300 DPI, 8.5×11" page is 8.4 megapixels.)
+
+.. code-block:: bash
+
+    # Allow 300 seconds for OCR; skip any page larger than 50 megapixels
+    ocrmypdf --tesseract-timeout 300 --skip-big 50 bigfile.pdf output.pdf
+
+Overriding default tesseract
+""""""""""""""""""""""""""""
+
+OCRmyPDF checks the system ``PATH`` for the ``tesseract`` binary.
+
+Some relevant environment variables that influence Tesseract's behavior include:
+
+.. envvar:: TESSDATA_PREFIX
+
+    Overrides the path to Tesseract's data files. This can allow simultaneous installation of the "best" and "fast" training data sets. OCRmyPDF does not manage this environment variable.
+
+.. envvar:: OMP_THREAD_LIMIT
+
+    Controls the number of threads Tesseract will use. OCRmyPDF will manage this environment if it is not already set. (Currently, it will set it to 1 because this gives the best results in testing.)
+
+For example, if you are testing tesseract 4.00 and don't wish to use an existing tesseract 3.04 installation, you can launch OCRmyPDF as follows:
+
+.. code-block:: bash
+
+    env \
+        PATH=/home/user/src/tesseract4/api:$PATH \
+        TESSDATA_PREFIX=/home/user/src/tesseract4 \
+        ocrmypdf --tesseract-oem 2 input.pdf output.pdf
+
+In this example ``TESSDATA_PREFIX`` directs Tesseract 4.0 to use LSTM training data. ``--tesseract-oem 1`` requests tesseract 4.0's new LSTM engine. (Tesseract 4.0 only.)
+
+
+Overriding other support programs
+"""""""""""""""""""""""""""""""""
+
+In addition to tesseract, OCRmyPDF uses the following external binaries:
+
+* ``gs`` (Ghostscript)
+* ``unpaper``
+* ``qpdf``
+
+In each case OCRmyPDF will search the ``PATH`` environment variable to locate the binaries.
+
+
+Changing tesseract configuration variables
+""""""""""""""""""""""""""""""""""""""""""
+
+You can override tesseract's default `control parameters <https://github.com/tesseract-ocr/tesseract/wiki/ControlParams>`_ with a configuration file.
+
+As an example, this configuration will disable Tesseract's dictionary for current language. Normally the dictionary is helpful for interpolating words that are unclear, but it may interfere with OCR if the document does not contain many words (for example, a list of part numbers).
+
+Create a file named "no-dict.cfg" with these contents:
+
+::
+
+    load_system_dawg 0
+    language_model_penalty_non_dict_word 0
+    language_model_penalty_non_freq_dict_word 0
+
+then run ocrmypdf as follows (along with any other desired arguments):
+
+.. code-block:: bash
+
+    ocrmypdf --tesseract-config no-dict.cfg input.pdf output.pdf
+
+.. warning::
+
+    Some combinations of control parameters will break Tesseract or break assumptions that OCRmyPDF makes about Tesseract's output.
+
+
+Changing the PDF renderer
+-------------------------
+
+rasterizing
+  Converting a PDF to an image for display.
+
+rendering
+  Creating a new PDF from other data (such as an existing PDF).
+
+
+OCRmyPDF has these PDF renderers: ``sandwich`` and ``hocr``. The renderer may be selected using ``--pdf-renderer``. The default is ``auto`` which lets OCRmyPDF select the renderer to use. Currently, ``auto`` selects ``sandwich`` for Tesseract 3.05.01 or newer, or ``hocr`` for older versions of Tesseract.
+
+The ``sandwich`` renderer
+"""""""""""""""""""""""""
+
+The ``sandwich`` renderer uses Tesseract's new text-only PDF feature, which produces a PDF page that lays out the OCR in invisible text. This page is then "sandwiched" onto the original PDF page, allowing lossless application of OCR even to PDF pages that contain other vector objects.
+
+Currently this is the best renderer for most uses, however it is implemented in Tesseract so OCRmyPDF cannot influence it. Currently some problematic PDF viewers like Mozilla PDF.js and macOS Preview have problems with segmenting its text output, and mightrunseveralwordstogether.
+
+When image preprocessing features like ``--deskew`` are used, the original PDF will be rendered as a full page and the OCR layer will be placed on top.
+
+If a PDF created with this renderer using Tesseract versions older than 3.05.00 is then passed through Ghostscript's pdfwrite feature, the OCR text *may* be corrupted. The ``--output-type=pdfa`` argument will produce a warning in this situation.  For this reason, OCRmyPDF automatically selects the ``hocr`` for older Tesseract versions.
+
+The ``hocr`` renderer
+"""""""""""""""""""""
+
+The ``hocr`` renderer works with older versions of Tesseract. The image layer is copied from the original PDF page if possible, avoiding potentially lossy transcoding or loss of other PDF information. If preprocessing is specified, then the image layer is a new PDF.
+
+Unlike ``sandwich`` this renderer is implemented within OCRmyPDF; anyone looking to customize how OCR is presented should look here. A major disadvantage of this renderer is it not capable of correctly handling text outside the Latin alphabet. Pull requests to improve the situation are welcome.
+
+Currently, this renderer has the best compatibility with Mozilla's PDF.js viewer.
+
+This works in all versions of Tesseract.
+
+The ``tesseract`` renderer
+""""""""""""""""""""""""""
+
+The ``tesseract`` renderer was removed. OCRmyPDF's new approach to text layer grafting makes it functionally equivalent to ``sandwich``.
+
+Return code policy
+------------------
+
+OCRmyPDF writes all messages to ``stderr``.  ``stdout`` is reserved for piping
+output files.  ``stdin`` is reserved for piping input files.
+
+The return codes generated by the OCRmyPDF are considered part of the stable
+user interface.  They may be imported from ``ocrmypdf.exceptions``.
+
+.. list-table:: Return codes
+    :widths: 5 35 60
+    :header-rows: 1
+
+    *	- Code
+        - Name
+        - Interpretation
+    *	- 0
+        - ``ExitCode.ok``
+        - Everything worked as expected.
+    *	- 1
+        - ``ExitCode.bad_args``
+        - Invalid arguments, exited with an error.
+    *	- 2
+        - ``ExitCode.input_file``
+        - The input file does not seem to be a valid PDF.
+    *	- 3
+        - ``ExitCode.missing_dependency``
+        - An external program required by OCRmyPDF is missing.
+    *	- 4
+        - ``ExitCode.invalid_output_pdf``
+        - An output file was created, but it does not seem to be a valid PDF. The file will be available.
+    *	- 5
+        - ``ExitCode.file_access_error``
+        - The user running OCRmyPDF does not have sufficient permissions to read the input file and write the output file.
+    *	- 6
+        - ``ExitCode.already_done_ocr``
+        - The file already appears to contain text so it may not need OCR. See output message.
+    *	- 7
+        - ``ExitCode.child_process_error``
+        - An error occurred in an external program (child process) and OCRmyPDF cannot continue.
+    *	- 8
+        - ``ExitCode.encrypted_pdf``
+        - The input PDF is encrypted. OCRmyPDF does not read encrypted PDFs. Use another program such as ``qpdf`` to remove encryption.
+    *	- 9
+        - ``ExitCode.invalid_config``
+        - A custom configuration file was forwarded to Tesseract using ``--tesseract-config``, and Tesseract rejected this file.
+    *   - 10
+        - ``ExitCode.pdfa_conversion_failed``
+        - A valid PDF was created, PDF/A conversion failed. The file will be available.
+    *	- 15
+        - ``ExitCode.other_error``
+        - Some other error occurred.
+    *	- 130
+        - ``ExitCode.ctrl_c``
+        - The program was interrupted by pressing Ctrl+C.

docs/batch.rst

@@ -0,0 +1,214 @@
+Batch processing
+================
+
+This article provides information about running OCRmyPDF on multiple files or configuring it as a service triggered by file system events.
+
+Batch jobs
+----------
+
+Consider using the excellent `GNU Parallel <https://www.gnu.org/software/parallel/>`_ to apply OCRmyPDF to multiple files at once.
+
+Both ``parallel`` and ``ocrmypdf`` will try to use all available processors. To maximize parallelism without overloading your system with processes, consider using ``parallel -j 2`` to limit parallel to running two jobs at once.
+
+This command will run all ocrmypdf all files named ``*.pdf`` in the current directory and write them to the previous created ``output/`` folder. It will not search subdirectories.
+
+The ``--tag`` argument tells parallel to print the filename as a prefix whenever a message is printed, so that one can trace any errors to the file that produced them.
+
+.. code-block:: bash
+
+	parallel --tag -j 2 ocrmypdf '{}' 'output/{}' ::: *.pdf
+
+OCRmyPDF automatically repairs PDFs before parsing and gathering information from them.  If you are already repairing PDFs with ``qpdf`` prior to attempting OCR, or you can use ``--skip-repair`` to skip this step.  It may improve performance for large files, since repairing PDFs is single-threaded.
+
+Directory trees
+---------------
+
+This will walk through a directory tree and run OCR on all files in place, printing the output in a way that makes 
+
+.. code-block:: bash
+
+	find . --printf '%p' -name '*.pdf' -exec ocrmypdf '{}' '{}' \;
+
+This only runs one ``ocrmypdf`` process at a time. This variation uses ``find`` to create a directory list and ``parallel`` to parallelize runs of ``ocrmypdf``, again updating files in place.
+
+.. code-block:: bash
+
+	find . -name '*.pdf' | parallel --tag -j 2 ocrmypdf '{}' '{}'
+
+
+Sample script
+"""""""""""""
+
+This user contributed script also provides an example of batch processing.
+
+.. code-block:: python
+
+	#!/usr/bin/env python3
+	# Walk through directory tree, replacing all files with OCR'd version
+	# Contributed by DeliciousPickle@github
+
+	import logging
+	import os
+	import subprocess
+	import sys
+
+	script_dir = os.path.dirname(os.path.realpath(__file__))
+	print(script_dir + '/ocr-tree.py: Start')
+
+	if len(sys.argv) > 1:
+	    start_dir = sys.argv[1]
+	else:
+	    start_dir = '.'
+
+	if len(sys.argv) > 2:
+	    log_file = sys.argv[2]
+	else:
+	    log_file = script_dir + '/ocr-tree.log'
+
+	logging.basicConfig(
+			level=logging.INFO, format='%(asctime)s %(message)s', 
+			filename=log_file, filemode='w')
+
+	for dir_name, subdirs, file_list in os.walk(start_dir):
+	    logging.info('\n')
+	    logging.info(dir_name + '\n')
+	    os.chdir(dir_name)
+	    for filename in file_list:
+	        file_ext = os.path.splitext(filename)[1]
+	        if file_ext == '.pdf':
+	            full_path = dir_name + '/' + filename
+	            print(full_path)
+	            cmd = ["ocrmypdf",  "--deskew", filename, filename]
+	            logging.info(cmd)
+	            proc = subprocess.Popen(
+	            	cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+	            result = proc.stdout.read()
+	            if proc.returncode == 6:
+	                print("Skipped document because it already contained text")
+	            elif proc.returncode == 0:
+	                print("OCR complete")
+	            logging.info(result)
+
+API
+"""
+
+OCRmyPDF is currently supported as a command line interface. This means that even if you are using OCRmyPDF in a Python script, you should run it in a subprocess rather importing the ocrmypdf package.
+
+The reason for this limitation is that the `ruffus <https://github.com/bunbun/ruffus/>`_ library that OCRmyPDF depends on is unfortunately not reentrant. OCRmyPDF works by defining each operation it does as a ruffus task that takes one or more files as input and generates one or more files as output. As such ruffus is fairly fundamental.
+
+(If you find individual functions implemented in OCRmyPDF useful (such as ``ocrmypdf.pdfinfo``), you can use these if you wish to.)
+
+
+Synology DiskStations
+"""""""""""""""""""""
+
+Synology DiskStations (Network Attached Storage devices) can run the Docker image of OCRmyPDF if the Synology `Docker package <https://www.synology.com/en-global/dsm/packages/Docker>`_ is installed. Attached is a script to address particular quirks of using OCRmyPDF on one of these devices.
+
+This is only possible for x86-based Synology products. Some Synology products use ARM or Power processors and do not support Docker. Further adjustments might be needed to deal with the Synology's relatively limited CPU and RAM.
+
+.. code-block:: python
+
+	#!/bin/env python3
+	# Contributed by github.com/Enantiomerie
+
+	# script needs 2 arguments
+	# 1. source dir with *.pdf - default is location of script
+	# 2. move dir where *.pdf and *_OCR.pdf are moved to
+
+	import logging
+	import os
+	import subprocess
+	import sys
+	import time
+	import shutil
+
+	script_dir = os.path.dirname(os.path.realpath(__file__))
+	timestamp = time.strftime("%Y-%m-%d-%H%M_")
+	log_file = script_dir + '/' + timestamp + 'ocrmypdf.log'
+	logging.basicConfig(level=logging.INFO, format='%(asctime)s %(message)s', filename=log_file, filemode='w')
+
+	if len(sys.argv) > 1:
+	    start_dir = sys.argv[1]
+	else:
+	    start_dir = '.'
+
+	for dir_name, subdirs, file_list in os.walk(start_dir):
+	    logging.info('\n')
+	    logging.info(dir_name + '\n')
+	    os.chdir(dir_name)
+	    for filename in file_list:
+	        file_ext = os.path.splitext(filename)[1]
+	        if file_ext == '.pdf':
+	            full_path = dir_name + '/' + filename
+	            file_noext = os.path.splitext(filename)[0]
+	            timestamp_OCR = time.strftime("%Y-%m-%d-%H%M_OCR_")
+	            filename_OCR = timestamp_OCR + file_noext + '.pdf'
+	            docker_mount = dir_name + ':/home/docker'
+	# create string for pdf processing 
+	# diskstation needs a user:group docker:docker. find uid:gid of your diskstation docker:docker with id docker.
+	# use this uid:gid in -u flag
+	# rw rights for docker:docker at source dir are also necessary
+	# the script is processed as root user via chron 
+	            cmd = ['docker', 'run', '--rm', '-v', docker_mount, '-u=1030:65538', 'jbarlow83/ocrmypdf', , '--deskew' , filename, filename_OCR]
+	            logging.info(cmd)
+	            proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+	            result = proc.stdout.read()
+	            logging.info(result)
+	            full_path_OCR = dir_name + '/' + filename_OCR
+	            os.chmod(full_path_OCR, 0o666)
+	            os.chmod(full_path, 0o666)
+	            full_path_OCR_archive = sys.argv[2]
+	            full_path_archive = sys.argv[2] + '/no_ocr'
+	            shutil.move(full_path_OCR,full_path_OCR_archive)
+	            shutil.move(full_path, full_path_archive)
+	logging.info('Finished.\n')
+
+
+
+Huge batch jobs
+"""""""""""""""
+
+If you have thousands of files to work with, contact the author. Consulting work related to OCRmyPDF helps fund this open source project and all inquiries are appreciated.
+
+
+Hot (watched) folders
+---------------------
+
+To set up a "hot folder" that will trigger OCR for every file inserted, use a program like Python `watchdog <https://pypi.python.org/pypi/watchdog>`_ (supports all major OS).
+
+One could then configure a scanner to automatically place scanned files in a hot folder, so that they will be queued for OCR and copied to the destination.
+
+.. code-block:: bash
+
+	pip install watchdog
+
+watchdog installs the command line program ``watchmedo``, which can be told to run ``ocrmypdf`` on any .pdf added to the current directory (``.``) and place the result in the previously created ``out/`` folder.
+
+.. code-block:: bash
+
+	cd hot-folder
+	mkdir out
+	watchmedo shell-command \
+		--patterns="*.pdf" \
+		--ignore-directories \
+		--command='ocrmypdf "${watch_src_path}" "out/${watch_src_path}" ' \
+		.  # don't forget the final dot
+
+For more complex behavior you can write a Python script around to use the watchdog API.
+
+On file servers, you could configure watchmedo as a system service so it will run all the time.
+
+Caveats
+"""""""
+
+* ``watchmedo`` may not work properly on a networked file system, depending on the capabilities of the file system client and server.
+* This simple recipe does not filter for the type of file system event, so file copies, deletes and moves, and directory operations, will all be sent to ocrmypdf, producing errors in several cases. Disable your watched folder if you are doing anything other than copying files to it.
+* If the source and destination directory are the same, watchmedo may create an infinite loop.
+* On BSD, FreeBSD and older versions of macOS, you may need to increase the number of file descriptors to monitor more files, using ``ulimit -n 1024`` to watch a folder of up to 1024 files.
+
+Alternatives
+""""""""""""
+
+* `Watchman <https://facebook.github.io/watchman/>`_ is a more powerful alternative to ``watchmedo``.
+
+

docs/bitmap_vs_svg.svg

@@ -0,0 +1,35 @@
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+<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 915 585" xmlns:xlink="http://www.w3.org/1999/xlink">
+<defs>
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+<stop stop-color="#333" offset="0"/>
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+</linearGradient>
+<linearGradient id="a" y2="414" gradientUnits="userSpaceOnUse" y1="159" x2="490" x1="815">
+<stop stop-color="#33f" offset="0"/>
+<stop stop-color="#3f3fff" stop-opacity="0" offset="1"/>
+</linearGradient>
+</defs>
+<path fill="url(#b)" d="m403 247c-12 115-135 122-368 123-4.3-1.07-7.32-7.33-6-41 76-37 151-124 167-236 93 123 201 40.9 207 154z"/>
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+<g font-size="100">
+<text y="518" x="210">Raster</text>
+<text y="518" x="695" fill="#338">Vector</text>
+</g>
+<text y="563" x="210">.jpeg  .gif  .png</text>
+<text y="563" x="696" fill="#338">.svg</text>
+</g>
+<path id="VectorLarge" fill="#005" d="m661 294v-62.5l23.4 0.184c0.678 20.8 7.32 36.3 19.9 46.4 12.7 9.93 32.1 14.9 57.9 14.9 24.1 0 42.5-4.29 55.1-12.9 12.7-8.71 19.1-21.3 19.1-37.9 0-13.2-3.86-23.4-11.6-30.5-7.59-7.11-23.7-14-48.4-20.8l-40.1-10.9c-29-7.97-49.5-17.9-61.4-29.8-11.8-11.9-17.7-28.2-17.7-48.9 0-23.3 9.15-41.4 27.4-54.3 18.3-12.9 44-19.3 77.1-19.3 14.1 0 29.6 1.41 46.4 4.23 16.8 2.7 34.7 6.68 53.7 12v58.5h-23c-2.3-19.4-9.49-33.4-21.6-41.9-11.9-8.71-30.2-13.1-54.7-13.1-21.4 0-37.7 3.99-49 12-11.1 7.85-16.7 19.3-16.7 34.4 0 13.1 4.2 23.4 12.6 30.9 8.4 7.48 26.2 14.9 53.5 22.3l37.6 10.1c27.5 7.48 47.1 17 58.8 28.7 11.8 11.5 17.7 27 17.7 46.5 0 26.6-9.42 46.7-28.3 60.2s-46.9 20.2-84.2 20.2c-16.7 0-33.7-1.53-51-4.6-18-3-35-7-53-13z"/>
+<use xlink:href="#VectorLarge" transform="matrix(.17 0 0 .17 392 313)"/>
+<use xlink:href="#RasterLarge" transform="matrix(.173 0 0 .173 -8.25 314)" height="100%" width="100%" y="0" x="0"/>
+</svg>

docs/conf.py

@@ -0,0 +1,368 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# ocrmypdf documentation build configuration file, created by
+# sphinx-quickstart on Sun Sep  4 14:29:43 2016.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    # 'sphinx.ext.mathjax',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The encoding of source files.
+#
+# source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = 'ocrmypdf'
+copyright = '2018, James R. Barlow. Licensed under Creative Commons Attribution-ShareAlike 4.0.'
+author = 'James R. Barlow'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+
+import os
+on_rtd = os.environ.get('READTHEDOCS') == 'True'
+
+if on_rtd:
+    # Help ReadTheDocs avoid having to install any binary extension modules
+    import sys
+    from unittest.mock import MagicMock
+
+    class Mock(MagicMock):
+        @classmethod
+        def __getattr__(cls, name):
+            return MagicMock()
+
+    MOCK_MODULES = ['pikepdf', 'libxmp', 'libxmp.utils']
+    sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
+
+
+from ocrmypdf import __version__ as OCRMYPDF_VERSION
+
+_version_parts = OCRMYPDF_VERSION.split('.')
+
+version = '.'.join(_version_parts[0:2])
+# The full version, including alpha/beta/rc tags.
+release = OCRMYPDF_VERSION
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#
+# today = ''
+#
+# Else, today_fmt is used as the format for a strftime call.
+#
+today_fmt = '%Y-%m-%d'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+#
+# default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#
+# add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#
+# add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#
+# show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+# modindex_common_prefix = []
+
+# If true, keep warnings as "system message" paragraphs in the built documents.
+# keep_warnings = False
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+import sphinx_rtd_theme
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+html_theme_options = {
+    'display_version': False
+}
+
+# Add any paths that contain custom themes here, relative to this directory.
+# html_theme_path = []
+
+# The name for this set of Sphinx documents.
+# "<project> v<release> documentation" by default.
+#
+# html_title = 'ocrmypdf v4.2'
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+#
+# html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#
+# html_logo = None
+
+# The name of an image file (relative to this directory) to use as a favicon of
+# the docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#
+# html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Add any extra paths that contain custom files (such as robots.txt or
+# .htaccess) here, relative to this directory. These files are copied
+# directly to the root of the documentation.
+#
+# html_extra_path = []
+
+# If not None, a 'Last updated on:' timestamp is inserted at every page
+# bottom, using the given strftime format.
+# The empty string is equivalent to '%b %d, %Y'.
+#
+# html_last_updated_fmt = None
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#
+# html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+#
+# html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#
+# html_additional_pages = {}
+
+# If false, no module index is generated.
+#
+# html_domain_indices = True
+
+# If false, no index is generated.
+#
+# html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#
+# html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#
+# html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+#
+# html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#
+# html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+#
+# html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+# html_file_suffix = None
+
+# Language to be used for generating the HTML full-text search index.
+# Sphinx supports the following languages:
+#   'da', 'de', 'en', 'es', 'fi', 'fr', 'h', 'it', 'ja'
+#   'nl', 'no', 'pt', 'ro', 'r', 'sv', 'tr', 'zh'
+#
+# html_search_language = 'en'
+
+# A dictionary with options for the search language support, empty by default.
+# 'ja' uses this config value.
+# 'zh' user can custom change `jieba` dictionary path.
+#
+# html_search_options = {'type': 'default'}
+
+# The name of a javascript file (relative to the configuration directory) that
+# implements a search results scorer. If empty, the default will be used.
+#
+# html_search_scorer = 'scorer.js'
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'ocrmypdfdoc'
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+     # The paper size ('letterpaper' or 'a4paper').
+     #
+     # 'papersize': 'letterpaper',
+
+     # The font size ('10pt', '11pt' or '12pt').
+     #
+     # 'pointsize': '10pt',
+
+     # Additional stuff for the LaTeX preamble.
+     #
+     # 'preamble': '',
+
+     # Latex figure (float) alignment
+     #
+     # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (master_doc, 'ocrmypdf.tex', 'ocrmypdf Documentation',
+     'James R. Barlow', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+#
+# latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+#
+# latex_use_parts = False
+
+# If true, show page references after internal links.
+#
+# latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+#
+# latex_show_urls = False
+
+# Documents to append as an appendix to all manuals.
+#
+# latex_appendices = []
+
+# It false, will not define \strong, \code, 	itleref, \crossref ... but only
+# \sphinxstrong, ..., \sphinxtitleref, ... To help avoid clash with user added
+# packages.
+#
+# latex_keep_old_macro_names = True
+
+# If false, no module index is generated.
+#
+# latex_domain_indices = True
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'ocrmypdf', 'ocrmypdf Documentation',
+     [author], 1)
+]
+
+# If true, show URL addresses after external links.
+#
+# man_show_urls = False
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (master_doc, 'ocrmypdf', 'ocrmypdf Documentation',
+     author, 'ocrmypdf', 'One line description of project.',
+     'Miscellaneous'),
+]
+
+# Documents to append as an appendix to all manuals.
+#
+# texinfo_appendices = []
+
+# If false, no module index is generated.
+#
+# texinfo_domain_indices = True
+
+# How to display URL addresses: 'footnote', 'no', or 'inline'.
+#
+# texinfo_show_urls = 'footnote'
+
+# If true, do not generate a @detailmenu in the "Top" node's menu.
+#
+# texinfo_no_detailmenu = False

docs/cookbook.rst

@@ -0,0 +1,218 @@
+Cookbook
+========
+
+Basic examples
+--------------
+
+Help!
+"""""
+
+ocrmypdf has built-in help.
+
+.. code-block:: bash
+
+    ocrmypdf --help
+
+
+Add an OCR layer and convert to PDF/A
+"""""""""""""""""""""""""""""""""""""
+
+.. code-block:: bash
+
+    ocrmypdf input.pdf output.pdf
+
+Add an OCR layer and output a standard PDF
+""""""""""""""""""""""""""""""""""""""""""
+
+.. code-block:: bash
+
+    ocrmypdf --output-type pdf input.pdf output.pdf
+
+Create a PDF/A with all color and grayscale images converted to JPEG
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+.. code-block:: bash
+
+    ocrmypdf --output-type pdfa --pdfa-image-compression jpeg input.pdf output.pdf
+
+Modify a file in place
+""""""""""""""""""""""
+
+The file will only be overwritten if OCRmyPDF is successful.
+
+.. code-block:: bash
+
+    ocrmypdf myfile.pdf myfile.pdf
+
+Correct page rotation
+"""""""""""""""""""""
+
+OCR will attempt to automatic correct the rotation of each page. This can help fix a scanning job that contains a mix of landscape and portrait pages.
+
+.. code-block:: bash
+
+    ocrmypdf --rotate-pages myfile.pdf myfile.pdf
+
+You can increase (decrease) the parameter ``--rotate-pages-threshold`` to make page rotation more (less) aggressive.
+
+If the page is "just a little off horizontal", like a crooked picture, then you want ``--deskew``. ``--rotate-pages`` is for when the cardinal angle is wrong.
+
+
+OCR languages other than English
+""""""""""""""""""""""""""""""""
+
+By default OCRmyPDF assumes the document is English.
+
+.. code-block:: bash
+
+    ocrmypdf -l fra LeParisien.pdf LeParisien.pdf
+    ocrmypdf -l eng+fra Bilingual-English-French.pdf Bilingual-English-French.pdf
+
+Language packs must be installed for all languages specified. See :ref:`Installing additional language packs <lang-packs>`.
+
+
+Produce PDF and text file containing OCR text
+"""""""""""""""""""""""""""""""""""""""""""""
+
+This produces a file named "output.pdf" and a companion text file named "output.txt".
+
+.. code-block:: bash
+
+    ocrmypdf --sidecar output.txt input.pdf output.pdf
+
+OCR images, not PDFs
+--------------------
+
+If you are starting with images, you can just use Tesseract 3.04 or later directly to convert images to PDFs:
+
+.. code-block:: bash
+
+    tesseract my-image.jpg output-prefix pdf
+
+.. code-block:: bash
+
+    # When there are multiple images
+    tesseract text-file-containing-list-of-image-filenames.txt output-prefix pdf
+
+Tesseract's PDF output is quite good – OCRmyPDF uses it by internally by default. However, OCRmyPDF has many features not available in Tesseract like like image processing, metadata control, and PDF/A generation.
+
+Use a program like `img2pdf <https://gitlab.mister-muffin.de/josch/img2pdf>`_ to convert your images to PDFs, and then pipe the results to run ocrmypdf.  The `-` tells ocrmypdf to read standard input.
+
+.. code-block:: bash
+
+    img2pdf my-images*.jpg | ocrmypdf - myfile.pdf
+
+``img2pdf`` is recommended because it does an excellent job at generating PDFs without transcoding images.
+
+For convenience, OCRmyPDF can also convert single images to PDFs on its own. If the resolution (dots per inch, DPI) of an image is not set or is incorrect, it can be overridden with ``--image-dpi``. (As 1 inch is 2.54 cm, 1 dpi = 0.39 dpcm).
+
+.. code-block:: bash
+
+    ocrmypdf --image-dpi 300 image.png myfile.pdf
+
+If you have multiple images, you must use ``img2pdf`` to convert the images to PDF.
+
+.. note::
+
+    ImageMagick ``convert`` can also convert a group of images to PDF, but in the author's experience it takes a long time, transcodes unnecessarily and gives poor results.
+
+
+Image processing
+----------------
+
+OCRmyPDF perform some image processing on each page of a PDF, if desired.  The same processing is applied to each page.  It is suggested that the user review files after image processing as these commands might remove desirable content, especially from poor quality scans.
+
+* ``--rotate-pages`` attempts to determine the correct orientation for each page and rotates the page if necessary.
+
+* ``--remove-background`` attempts to detect and remove a noisy background from grayscale or color images.  Monochrome images are ignored. This should not be used on documents that contain color photos as it may remove them.
+
+* ``--deskew`` will correct pages were scanned at a skewed angle by rotating them back into place.  Skew determination and correction is performed using `Postl's variance of line sums <http://www.leptonica.com/skew-measurement.html>`_ algorithm as implemented in `Leptonica <http://www.leptonica.com/index.html>`_.
+
+* ``--clean`` uses `unpaper <https://www.flameeyes.eu/projects/unpaper>`_ to clean up pages before OCR, but does not alter the final output.  This makes it less likely that OCR will try to find text in background noise.
+
+* ``--clean-final`` uses unpaper to clean up pages before OCR and inserts the page into the final output.  You will want to review each page to ensure that unpaper did not remove something important.
+
+.. note::
+
+    In many cases image processing will rasterize PDF pages as images, potentially losing quality.
+
+.. warning::
+
+    ``--clean-final`` and ``-remove-background`` may leave undesirable visual artifacts in some images where their algorithms have shortcomings. Files should be visually reviewed after using these options.
+
+
+OCR and correct document skew (crooked scan)
+""""""""""""""""""""""""""""""""""""""""""""
+
+Deskew:
+
+.. code-block:: bash
+
+    ocrmypdf --deskew input.pdf output.pdf
+
+Image processing commands can be combined. The order in which options are given does not matter. OCRmyPDF always applies the steps of the image processing pipeline in the same order (rotate, remove background, deskew, clean).
+
+.. code-block:: bash
+
+    ocrmypdf --deskew --clean --rotate-pages input.pdf output.pdf
+
+
+Don't actually OCR my PDF
+"""""""""""""""""""""""""
+
+If you set ``--tesseract-timeout 0`` OCRmyPDF will apply its image processing without performing OCR, if all you want to is to apply image processing or PDF/A conversion.
+
+.. code-block:: bash
+
+    ocrmypdf --tesseract-timeout=0 --remove-background input.pdf output.pdf
+
+
+Redo OCR
+""""""""
+
+To redo OCR on a file OCRed with other OCR software or a previous version of OCRmyPDF and/or Tesseract, you may use the ``--force-ocr`` argument. Normally, OCRmyPDF does not modify files that already appear to contain OCR text.
+
+.. code-block:: bash
+
+    ocrmypdf --force-ocr input.pdf output.pdf
+
+Note that the method above will force rasterization of all pages, potentially reducing quality or losing vector content.
+
+To ensure quality is preserved, one could extract all of the images and rebuild the PDF for a lossless transformation. This recipe does not work when PDFs contain multiple images per page, as many do in practice. It will also lose any page rotation information.
+
+.. code-block:: bash
+
+    pdfimages -all old-ocr.pdf prefix  # extract all images
+    img2pdf -o temp.pdf prefix*        # construct new PDF from the images
+    # review the new PDF to ensure it visually matches the old one
+    ocrmypdf --output-type pdf temp.pdf new-ocr.pdf
+
+``--output-type pdf`` is used here to avoid using Ghostscript which will also rasterize images.
+
+
+Improving OCR quality
+---------------------
+
+The `Image processing`_ features can improve OCR quality.
+
+Rotating pages and deskewing helps to ensure that the page orientation is correct before OCR begins. Removing the background and/or cleaning the page can also improve results. The ``--oversample DPI`` argument can be specified to resample images to higher resolution before attempting OCR; this can improve results as well.
+
+OCR quality will suffer if the resolution of input images is not correct (since the range of pixel sizes that will be checked for possible fonts will also be incorrect).
+
+
+PDF optimization
+----------------
+
+By default OCRmyPDF will attempt to perform lossless optimizations on the images inside PDFs after OCR is complete. Optimization is performed even if no OCR text is found.
+
+The ``--optimize N`` (short form ``-O``) argument controls optimization, where ``N`` ranges from 0 to 3. ``--optimize 0`` disables optimizations. ``1`` enables lossless optimizations that can be performed safely with no quality loss. ``2`` enables lossy optimizations such as image color quantizations. ``3`` enables more aggressive optimizations and targets a lower JPEG quality.
+
+Optimization is improved when a JBIG2 encoder is available and when ``pngquant`` is installed. If either of these components are missing, then some types of images will not be optimized.
+
+Currently optimization attempts to find more efficient encodings for images. The types of optimization available may expand over time. By default, OCRmyPDF compresses data streams inside PDFs, and will change inefficient encodings to more modern versions. A program like ``qpdf`` can be used to change encodings, e.g. to inspect the internals fo a PDF.
+
+.. code-block:: bash
+
+    ocrmypdf --optimize 3 in.pdf out.pdf  # Make it small
+
+Some users may consider enabling lossy JBIG2. See: :ref:`jbig2-lossy`.

docs/errors.rst

@@ -0,0 +1,33 @@
+Common error messages
+=====================
+
+Page already has text
+---------------------
+
+.. code::
+
+	ERROR -    1: page already has text! – aborting (use --force-ocr to force OCR)
+
+You ran ocrmypdf on a file that already contains printable text or a hidden OCR text layer (it can't quite tell the difference). You probably don't want to do this, because the file is already searchable.
+
+As the error message suggests, your options are:
+
+- ``ocrmypdf --force-ocr`` to :ref:`rasterize <raster-vector>` all vector content and run OCR on the images. This is useful if a previous OCR program failed, or if the document contains a text watermark.
+
+- ``ocrmypdf --skip-text`` to skip OCR and other processing on any pages that contain text. Text pages will be copied into the output PDF without modification.
+
+
+Input file 'filename' is not a valid PDF
+----------------------------------------
+
+OCRmyPDF passes files through qpdf, a program that fixes errors in PDFs, before it tries to work on them. In most cases this happens because the PDF is corrupt and
+truncated (incomplete file copying) and not much can be done.
+
+You can try rewriting the file with Ghostscript or pdftk:
+
+- ``gs -o output.pdf -dSAFER -sDEVICE=pdfwrite input.pdf``
+
+- ``pdftk input.pdf cat output output.pdf``
+
+Sometimes Acrobat can repair PDFs with its `Preflight tool <https://helpx.adobe.com/acrobat/using/correcting-problem-areas-preflight-tool.html>`_.
+

docs/index.rst

@@ -0,0 +1,39 @@
+.. ocrmypdf documentation master file, created by
+   sphinx-quickstart on Sun Sep  4 14:29:43 2016.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+OCRmyPDF documentation
+======================
+
+OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to
+be searched.
+
+PDF is the best format for storing and exchanging scanned documents.  Unfortunately, PDFs can be difficult to modify. OCRmyPDF makes it easy to apply image processing and OCR to existing PDFs.
+
+.. toctree::
+   :maxdepth: 1
+
+   introduction
+   release_notes
+   installation
+   languages
+   jbig2
+
+.. toctree::
+   :caption: Usage
+   :maxdepth: 2
+
+   cookbook
+   advanced
+   batch
+   security
+   errors
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`

docs/installation.rst

@@ -0,0 +1,541 @@
+Installation
+============
+
+.. |latest| image:: https://img.shields.io/pypi/v/ocrmypdf.svg
+    :alt: OCRmyPDF latest released version on PyPI
+
+|latest|
+
+The easiest way to install OCRmyPDF to follow the steps for your operating system/platform.
+
+If you want to use the latest version of OCRmyPDF, your best bet is to install the most recent version your platform provides, and then upgrade that version by installing the Python binary wheels.
+
+.. contents:: Platform-specific steps
+    :depth: 2
+    :local:
+
+Installing on Linux
+-------------------
+
+Debian and Ubuntu 16.10 or newer
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. |deb-stable| image:: https://repology.org/badge/version-for-repo/debian_stable/ocrmypdf.svg
+    :alt: Debian 9 stable ("stretch")
+
+.. |deb-testing| image:: https://repology.org/badge/version-for-repo/debian_testing/ocrmypdf.svg
+    :alt: Debian 10 testing ("buster")
+
+.. |deb-unstable| image:: https://repology.org/badge/version-for-repo/debian_unstable/ocrmypdf.svg
+    :alt: Debian unstable
+
+.. |ubu-1710| image:: https://repology.org/badge/version-for-repo/ubuntu_17_10/ocrmypdf.svg
+    :alt: Ubuntu 17.10
+
+.. |ubu-1804| image:: https://repology.org/badge/version-for-repo/ubuntu_18_04/ocrmypdf.svg
+    :alt: Ubuntu 18.04 LTS
+
+.. |ubu-1810| image:: https://repology.org/badge/version-for-repo/ubuntu_18_10/ocrmypdf.svg
+    :alt: Ubuntu 18.10
+
+
++-------------------------------------------+
+| **OCRmyPDF version**                      |
++-------------------------------------------+
+| |latest|                                  |
++-------------------------------------------+
+| |deb-stable| |deb-testing| |deb-unstable| |
++-------------------------------------------+
+| |ubu-1710| |ubu-1804| |ubu-1810|          |
++-------------------------------------------+
+
+Users of Debian 9 ("stretch") or later or Ubuntu 16.10 or later may simply
+
+.. code-block:: bash
+
+    apt-get install ocrmypdf
+
+As indicated in the table above, Debian and Ubuntu releases may lag behind the latest version. If the version available for your platform is out of date, you could opt to install the latest version from source. See `Installing HEAD revision from sources`_.
+
+For full details on version availability for your platform, check the `Debian Package Tracker <https://tracker.debian.org/pkg/ocrmypdf>`_ or `Ubuntu launchpad.net <https://launchpad.net/ocrmypdf>`_.
+
+.. note::
+
+    OCRmyPDF for Debian and Ubuntu currently omit the JBIG2 encoder. OCRmyPDF works fine without it but will produce larger output files. If you build jbig2enc from source, ocrmypdf 7.0.0 and later will automatically detect it (specifically the ``jbig2`` binary) on the ``PATH``. To add JBIG2 encoding, see :ref:`jbig2`.
+
+Installing the latest version on Ubuntu 18.04 LTS
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Ubuntu 18.04 includes ocrmypdf 6.1.2. To install a more recent version, first
+install the system version to get most of the dependencies:
+
+.. code-block:: bash
+
+    sudo apt-get update
+    sudo apt-get install \
+        ocrmypdf \
+        python3-pip
+
+There are a few dependency changes between ocrmypdf 6.1.2 and 7.x. Let's get
+these, too.
+
+.. code-block:: bash
+
+    sudo apt-get install \
+        libexempi3 \
+        pngquant
+
+Then install the most recent ocrmypdf for the local user and set the user's ``PATH`` to check for the user's Python packages.
+
+.. code-block:: bash
+
+    export PATH=$HOME/.local/bin:$PATH
+    pip3 install --user ocrmypdf
+
+To add JBIG2 encoding, see :ref:`jbig2`.
+
+Ubuntu 16.04 LTS
+^^^^^^^^^^^^^^^^
+
+No package is currently available for Ubuntu 16.04, but you can install the dependencies manually:
+
+.. code-block:: bash
+
+    sudo apt-get update
+    sudo apt-get install \
+        ghostscript \
+        libexempi3 \
+        pngquant \
+        python3-cffi \
+        python3-pip \
+        qpdf \
+        tesseract-ocr \
+        unpaper
+
+If you wish install OCRmyPDF for the current user, and ensure that the ``PATH``
+environment variable contains ``$HOME/.local/bin``.
+
+.. code-block:: bash
+
+    export PATH=$HOME/.local/bin:$PATH
+    pip3 install --user ocrmypdf
+
+Alternately, you can install ocrmypdf system-wide. (Not recommended.)
+
+.. code-block:: bash
+
+    sudo pip3 install ocrmypdf
+
+At your option, you may upgrade Ubuntu 16.04 LTS to Tesseract 4.0 for improved OCR results.
+
+.. code-block:: bash
+
+    sudo apt-get install -y software-properties-common python-software-properties
+    sudo add-apt-repository ppa:alex-p/tesseract-ocr -y
+    sudo apt-get update
+    sudo apt-get upgrade tesseract-ocr
+
+To add JBIG2 encoding, see :ref:`jbig2`.
+
+Ubuntu 14.04 LTS
+^^^^^^^^^^^^^^^^
+
+Installing on Ubuntu 14.04 LTS (trusty) is more difficult than some other options, because it is older and does not provide ``pip``.
+
+Update apt-get:
+
+.. code-block:: bash
+
+    sudo apt-get update
+
+Install system dependencies:
+
+.. code-block:: bash
+
+    sudo apt-get install \
+        software-properties-common python-software-properties \
+        zlib1g-dev \
+        libexempi3 \
+        libjpeg-dev \
+        libffi-dev \
+        pngquant \
+        qpdf
+
+We will need backports of Ghostscript 9.16, libav-11 (for unpaper 6.1), Tesseract 4.00 (alpha), and Python 3.6. This will replace Ghostscript and Tesseract 3.x on your system. Python 3.6 will be installed alongside the system Python 3.4.
+
+If you prefer to not modify your system in this matter, consider using a Docker container.
+
+.. code-block:: bash
+
+    sudo add-apt-repository ppa:vshn/ghostscript -y
+    sudo add-apt-repository ppa:heyarje/libav-11 -y
+    sudo add-apt-repository ppa:alex-p/tesseract-ocr -y
+    sudo add-apt-repository ppa:jonathonf/python-3.6 -y
+
+    sudo apt-get update
+
+    sudo apt-get install \
+        python3.6-dev \
+        ghostscript \
+        tesseract-ocr \
+        tesseract-ocr-eng \
+        libavformat56 libavcodec56 libavutil54 \
+        wget
+
+Now we need to install ``pip`` and let it install ocrmypdf:
+
+.. code-block:: bash
+
+    curl https://bootstrap.pypa.io/ez_setup.py -o - | python3.6 && python3.6 -m easy_install pip
+    pip3.6 install ocrmypdf
+
+The ``wget`` command will download a program and run it.
+
+These installation instructions omit the optional dependency ``unpaper``, which is only available at version 0.4.2 in Ubuntu 14.04. The author could not find a backport of ``unpaper``, and created a .deb package to do the job of installing unpaper 6.1 (for x86 64-bit only):
+
+.. code-block:: bash
+
+    wget -q 'https://www.dropbox.com/s/vaq0kbwi6e6au80/unpaper_6.1-1.deb?raw=1' -O unpaper_6.1-1.deb
+    sudo dpkg -i unpaper_6.1-1.deb
+
+To add JBIG2 encoding, see :ref:`jbig2`.
+
+ArchLinux
+^^^^^^^^^
+
+.. image:: https://repology.org/badge/version-for-repo/aur/ocrmypdf.svg
+    :alt: ArchLinux
+    :target: https://repology.org/metapackage/ocrmypdf
+
+The author is aware of an `ArchLinux User Repository package for ocrmypdf <https://aur.archlinux.org/packages/ocrmypdf/>`_. You can use the following command.
+
+.. code-block:: bash
+
+    yaourt -S ocrmypdf
+
+If you have any difficulties with installation, check the repository package page.
+
+Other Linux packages
+^^^^^^^^^^^^^^^^^^^^
+
+See the `Repology <https://repology.org/metapackage/ocrmypdf/versions>`_ page.
+
+In general, first install the OCRmyPDF package for your system, then optionally use the procedure `Installing with Python pip`_ to install a more recent version.
+
+Installing on macOS
+-------------------
+
+Homebrew
+^^^^^^^^
+
+.. image:: https://img.shields.io/homebrew/v/ocrmypdf.svg
+    :alt: homebrew
+    :target: http://brewformulas.org/Ocrmypdf
+
+OCRmyPDF is now a standard `Homebrew <https://brew.sh>`_ formula. To install on macOS:
+
+.. code-block:: bash
+
+    brew install ocrmypdf
+
+.. note::
+
+    Users who previously installed OCRmyPDF on macOS using ``pip install ocrmypdf`` should remove the pip version (``pip3 uninstall ocrmypdf``) before switching to the Homebrew version.
+
+.. note::
+
+    Users who previously installed OCRmyPDF from the private tap should switch to the mainline version (``brew untap jbarlow83/ocrmypdf``) and install from there.
+
+Manual installation on macOS
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+These instructions probably work on all macOS supported by Homebrew.
+
+If it's not already present, `install Homebrew <http://brew.sh/>`_.
+
+Update Homebrew:
+
+.. code-block:: bash
+
+    brew update
+
+Install or upgrade the required Homebrew packages, if any are missing. To do this, download the ``Brewfile`` that lists all of the dependencies to the current directory, and run ``brew bundle`` to process them (installing or upgrading as needed). ``Brewfile`` is a plain text file.
+
+.. code-block:: bash
+
+    wget https://github.com/jbarlow83/OCRmyPDF/raw/master/.travis/Brewfile
+    brew bundle
+
+This will include the English, French, German and Spanish language packs. If you need other languages you can optionally install them all:
+
+.. _macos-all-languages:
+
+.. code-block:: bash
+
+    brew install tesseract --with-all-languages  # Option 2: for all language packs
+
+Update the homebrew pip:
+
+.. code-block:: bash
+
+    pip3 install --upgrade pip
+
+You can then install OCRmyPDF from PyPI, for the current user:
+
+.. code-block:: bash
+
+    pip3 install --user ocrmypdf
+
+or system-wide:
+
+.. code-block:: bash
+
+    pip3 install ocrmypdf
+
+The command line program should now be available:
+
+.. code-block:: bash
+
+    ocrmypdf --help
+
+.. _docker-install:
+
+Installing the Docker image
+---------------------------
+
+For some users, installing the Docker image will be easier than installing all of OCRmyPDF's dependencies. For Windows, it is the only option.
+
+If you have `Docker <https://docs.docker.com/>`_ installed on your system, you can install a Docker image of the latest release.
+
+Follow the Docker installation instructions for your platform.  If you can run this command successfully, your system is ready to download and execute the image:
+
+.. code-block:: bash
+
+    docker run hello-world
+
+OCRmyPDF will use all available CPU cores.  By default, the VirtualBox machine instance on Windows and macOS has only a single CPU core enabled. Use the VirtualBox Manager to determine the name of your Docker engine host, and then follow these optional steps to enable multiple CPUs:
+
+.. code-block:: bash
+
+    # Optional step for Mac OS X users
+    docker-machine stop "yourVM"
+    VBoxManage modifyvm "yourVM" --cpus 2  # or whatever number of core is desired
+    docker-machine start "yourVM"
+    eval $(docker-machine env "yourVM")
+
+Assuming you have a Docker engine running, you can download one of the three available images:
+
+.. list-table::
+    :widths: auto
+    :header-rows: 1
+
+    *   - Image name
+        - Download command
+        - Notes
+    *   - ocrmypdf
+        - ``docker pull jbarlow83/ocrmypdf``
+        - Latest ocrmypdf with Tesseract 4.0.0-beta1 on Ubuntu 18.04. Includes English, French, German, Spanish, Portugeuse and Simplified Chinese.
+    *   - ocrmypdf-polyglot
+        - ``docker pull jbarlow83/ocrmypdf-polyglot``
+        - As above, with all available language packs.
+
+For example:
+
+.. code-block:: bash
+
+    docker pull jbarlow83/ocrmypdf
+
+Then tag it to give a more convenient name, just ocrmypdf:
+
+.. code-block:: bash
+
+    docker tag jbarlow83/ocrmypdf ocrmypdf
+
+.. _docker-polyglot:
+
+The alternative "polyglot" image provides `all available language packs <https://github.com/tesseract-ocr/tesseract/blob/master/doc/tesseract.1.asc#languages>`_.
+
+You can then run ocrmypdf using the command:
+
+.. code-block:: bash
+
+    docker run --rm ocrmypdf --help
+
+To execute the OCRmyPDF on a local file, you must `provide a writable volume to the Docker image <https://docs.docker.com/userguide/dockervolumes/>`_, and both the input and output file must be inside the writable volume.  This example command uses the current working directory as the writable volume:
+
+.. code-block:: bash
+
+    docker run --rm -v "$(pwd):/home/docker" <other docker arguments>   ocrmypdf <your arguments to ocrmypdf>
+
+In this worked example, the current working directory contains an input file called ``test.pdf`` and the output will go to ``output.pdf``:
+
+.. code-block:: bash
+
+    docker run --rm -v "$(pwd):/home/docker"   ocrmypdf --skip-text test.pdf output.pdf
+
+.. note:: The working directory should be a writable local volume or Docker may not have permission to access it.
+
+Note that ``ocrmypdf`` has its own separate ``-v VERBOSITYLEVEL`` argument to control debug verbosity. All Docker arguments should before the ``ocrmypdf`` image name and all arguments to ``ocrmypdf`` should be listed after.
+
+In some environments the permissions associated with Docker can be complex to configure. The process that executes Docker may end up not having the permissions to write the specified file system. In that case one can stream the file into and out of the Docker process and avoid all permission hassles, using ``-`` as the input and output filename:
+
+.. code-block:: bash
+
+    docker run --rm -i   ocrmypdf <other arguments to ocrmypdf> - - <input.pdf >output.pdf
+
+For convenience, a shell alias can hide the docker command:
+
+.. code-block:: bash
+
+    alias ocrmypdf='docker run --rm -v "$(pwd):/home/docker" ocrmypdf'
+    ocrmypdf --version  # runs docker version
+
+Or in the wonderful `fish shell <https://fishshell.com/>`_:
+
+.. code-block:: fish
+
+    alias ocrmypdf 'docker run --rm -v (pwd):/home/docker ocrmypdf'
+    funcsave ocrmypdf
+
+.. note::
+
+    The ocrmypdf Docker images are designed for application delivery, to enable use of OCRmyPDF without fussing with dependencies. ``docker run --rm`` argument tells Docker to delete the container after it runs, because each container is only good for a single job. The Docker image is not designed for use as a persistent web service or for use on Amazon EC2 Container Service (AWS ECS).
+
+Installing on Windows
+---------------------
+
+Direct installation on Windows is not possible.  `Install the Docker <docker-install_>`_ container as described above.  Ensure that your command prompt can run the docker "hello world" container.
+
+It would probably not be too difficult to run on Windows.  The main reason this has been avoided is the difficulty of packaging and installing the various non-Python dependencies: Tesseract, QPDF, Ghostscript, Leptonica.  Pull requests to add or improve Windows support would be quite welcome.
+
+
+Running on Windows
+~~~~~~~~~~~~~~~~~~
+
+The command line syntax to run ocrmypdf from a command prompt will resemble:
+
+.. code-block:: bat
+
+    docker run -v /c/Users/sampleuser:/home/docker ocrmypdf --skip-text test.pdf output.pdf
+
+where /c/Users/sampleuser is a Unix representation of the Windows path C:\\Users\\sampleuser, assuming a user named "sampleuser" is running ocrmypdf on a file in their home directory, and the files "test.pdf" and "output.pdf" are in the sampleuser folder. The Windows user must have read and write permissions.
+
+`Bash on Ubuntu on Windows <https://github.com/Microsoft/BashOnWindows>`_ should also be a viable route for running the OCRmyPDF Docker container.
+
+
+Installing with Python pip
+--------------------------
+
+OCRmyPDF is delivered by PyPI because it is a convenient way to install the latest version. However, PyPI and ``pip`` cannot address the fact that ``ocrmypdf`` depends on certain non-Python system libraries and programs being instsalled.
+
+For best results, first install `your platform's version <https://repology.org/metapackage/ocrmypdf/versions>`_ of ``ocrmypdf``, using the instructions elsewhere in this document. Then you can use ``pip`` to get the latest version if your platform version is out of date. Chances are that this will satisfy most dependencies.
+
+Use ``ocrmypdf --version`` to confirm what version was installed.
+
+Then you can install the latest OCRmyPDF from the Python wheels. First try:
+
+.. code-block:: bash
+
+    pip3 install --user ocrmypdf
+
+You should then be able to run ``ocrmypdf --version`` and see that the latest version was located.
+
+Since ``pip3 install --user`` does not work correctly on some platforms, notably Ubuntu 16.04 and older, and the Homebrew version of Python, instead use this for a system wide installation:
+
+.. code-block:: bash
+
+    pip3 install ocrmypdf
+
+Requirements for pip and HEAD install
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+OCRmyPDF currently requires these external programs and libraries to be installed, and must be satisfied using the operating system package manager. ``pip`` cannot provide them.
+
+- Python 3.5 or newer
+- Ghostscript 9.15 or newer
+- libexempi3 2.2.0 or newer
+- qpdf 8.1.0 or newer
+- Tesseract 3.04 or newer
+
+As of ocrmypdf 7.0.0, the following versions are recommended:
+
+- Python 3.7
+- Ghostscript 9.23
+- libexempi3 2.4.5
+- qpdf 8.1.0
+- Tesseract 4.0.0-beta1
+- jbig2enc 0.29 or newer
+- pngquant 2.5 or newer
+- unpaper 6.1
+
+jbig2enc, pngquant, and unpaper are optional. If missing certain features are disabled. OCRmyPDF will discover them as soon as they are available.
+
+**jbig2enc**, if present, will be used to optimize the encoding of monochrome images.  This can significantly reduce the file size of the output file.  It is not required.  `jbig2enc <https://github.com/agl/jbig2enc>`_ is not generally available for Ubuntu or Debian due to lingering concerns about patent issues, but can easily be built from source. To add JBIG2 encoding, see :ref:`jbig2`.
+
+**pngquant**, if present, is optionally used to optimize the encoding of PNG-style images in PDFs (actually, any that are that losslessly encoded) by lossily quantizing to a smaller color palette. It is only activated then the ``--optimize`` argument is ``2`` or ``3``.
+
+**unpaper**, if present, enables the ``--clean`` and ``--clean-final`` command line options.
+
+These are in addition to the Python packaging dependencies, meaning that unfortunately, the ``pip install`` command cannot satisfy all of them.
+
+Python 3.7 and Tesseract 4.0.0-beta.1 are recommended for best OCR results and best performance.
+
+
+Installing HEAD revision from sources
+-------------------------------------
+
+If you have ``git`` and Python 3.5 or newer installed, you can install from source. When the ``pip`` installer runs, it will alert you if dependencies are missing.
+
+If you prefer to build every from source, you will need to `build pikepdf from source <https://pikepdf.readthedocs.io/en/latest/installation.html#building-from-source>`_. First ensure you can build and install pikepdf.
+
+To install the HEAD revision from sources in the current Python 3 environment:
+
+.. code-block:: bash
+
+    pip3 install git+https://github.com/jbarlow83/OCRmyPDF.git
+
+Or, to install in `development mode <https://pythonhosted.org/setuptools/setuptools.html#development-mode>`_,  allowing customization of OCRmyPDF, use the ``-e`` flag:
+
+.. code-block:: bash
+
+    pip3 install -e git+https://github.com/jbarlow83/OCRmyPDF.git
+
+You may find it easiest to install in a virtual environment, rather than system-wide:
+
+.. code-block:: bash
+
+    git clone -b master https://github.com/jbarlow83/OCRmyPDF.git
+    python3 -m venv
+    source venv/bin/activate
+    cd OCRmyPDF
+    pip3 install .
+
+However, ``ocrmypdf`` will only be accessible on the system PATH
+when you activate the virtual environment.
+
+To run the program:
+
+.. code-block:: bash
+
+    ocrmypdf --help
+
+If not yet installed, the script will notify you about dependencies that
+need to be installed. The script requires specific versions of the
+dependencies. Older version than the ones mentioned in the release notes
+are likely not to be compatible to OCRmyPDF.
+
+For development
+~~~~~~~~~~~~~~~
+
+To install all of the development and test requirements:
+
+.. code-block:: bash
+
+    git clone -b master https://github.com/jbarlow83/OCRmyPDF.git
+    python3 -m venv
+    source venv/bin/activate
+    cd OCRmyPDF
+    pip install -e .
+    pip install -r requirements/dev.txt -r requirements/test.txt
+
+To add JBIG2 encoding, see :ref:`jbig2`.

docs/introduction.rst

@@ -0,0 +1,115 @@
+Introduction
+============
+OCRmyPDF is a Python 3 package that adds OCR layers to PDFs.
+
+About OCR
+---------
+
+`Optical character recognition <https://en.wikipedia.org/wiki/Optical_character_recognition>`_ is technology that converts images of typed or handwritten text, such as in a scanned document, to computer text that can be searched and copied.
+
+OCRmyPDF uses `Tesseract <https://github.com/tesseract-ocr/tesseract>`_, the best available open source OCR engine, to perform OCR.
+
+.. _raster-vector:
+
+About PDFs
+----------
+
+PDFs are page description files that attempts to preserve a layout exactly. They  contain `vector graphics <http://vector-conversions.com/vectorizing/raster_vs_vector.html>`_ that can contain raster objects such as scanned images. Because PDFs can contain multiple pages (unlike many image formats) and can contain fonts and text, it is a good formats for exchanging scanned documents.
+
+.. image:: bitmap_vs_svg.svg
+
+A PDF page might contain multiple images, even if it only appears to have one image.  Some scanners or scanning software will segment pages into monochromatic text and color regions for example, to improve the compression ratio and appearance of the page.
+
+Rasterizing a PDF is the process of generating an image suitable for display or analyzing with an OCR engine.  OCR engines like Tesseract work with images, not vector objects.
+
+
+About PDF/A
+-----------
+
+`PDF/A <https://en.wikipedia.org/wiki/PDF/A>`_ is an ISO-standardized subset of the full PDF specification that is designed for archiving (the 'A' stands for Archive).  PDF/A differs from PDF primarily by omitting features that would make it difficult to read the file in the future, such as embedded Javascript, video, audio and references to external fonts.  All fonts and resources needed to interpret the PDF must be contained within it. Because PDF/A disables Javascript and other types of embedded content, it is probably more secure.
+
+There are various conformance levels and versions, such as "PDF/A-2b".
+
+Generally speaking, the best format for scanned documents is PDF/A. Some governments and jurisdictions, US Courts in particular, `mandate the use of PDF/A <https://pdfblog.com/2012/02/13/what-is-pdfa/>`_ for scanned documents.
+
+Since most people who scan documents are interested in reading them indefinitely into the future, OCRmyPDF generates PDF/A-2b by default.
+
+PDF/A has a few drawbacks.  Some PDF viewers include an alert that the file is a PDF/A, which may confuse some users.  It also tends to produce larger files than PDF, because it embeds certain resources even if they are commonly available. PDF/A files can be digitally signed, but may not be encrypted, to ensure they can be read in the future.  Fortunately, converting from PDF/A to a regular PDF is trivial, and any PDF viewer can view PDF/A.
+
+
+What OCRmyPDF does
+------------------
+
+OCRmyPDF analyzes each page of a PDF to determine the colorspace and resolution (DPI) needed to capture all of the information on that page without losing content.  It uses `Ghostscript <http://ghostscript.com/>`_ to rasterize the page, and then performs on OCR on the rasterized image to create an OCR "layer". The layer is then grafted back onto the original PDF.
+
+While one can use a program like Ghostscript or ImageMagick to get an image and put the image through Tesseract, that actually creates a new PDF and many details may be lost. OCRmyPDF can produce a minimally changed PDF as output.
+
+OCRmyPDF also some image processing options like deskew which improve the appearance of files and quality of OCR. When these are used, the OCR layer is grafted onto the processed image instead.
+
+By default, OCRmyPDF produces archival PDFs – PDF/A, which are a stricter subset of PDF features designed for long term archives. If regular PDFs are desired, this can be disabled with ``--output-type pdf``.
+
+
+Why you shouldn't do this manually
+----------------------------------
+
+A PDF is similar to an HTML file, in that it contains document structure along with images.  Sometimes a PDF does nothing more than present a full page image, but often there is additional content that would be lost.
+
+A manual process could work like either of these:
+
+1. Rasterize each page as an image, OCR the images, and combine the output into a PDF. This preserves the layout of each page, but resamples all images (possibly losing quality, increasing file size, introducing compression artifacts, etc.).
+
+2. Extract each image, OCR, and combine the output into a PDF. This loses the context in which images are used in the PDF, meaning that cropping, rotation and scaling of pages may be lost. Some scanned PDFs use multiple images segmented into black and white, grayscale and color regions, with stencil masks to prevent overlap, as this can enhance the appearance of a file while reducing file size. Clearly, reassembling these images will be easy. This also loses and text or vector art on any pages in a PDF with both scanned and pure digital content.
+
+In the case of a PDF that is nothing other than a container of images (no rotation, scaling, cropping, one image per page), the second approach can be lossless.
+
+OCRmyPDF uses several strategies depending on input options and the input PDF itself, but generally speaking it rasterizes a page for OCR and then grafts the OCR back onto the original. As such it can handle complex PDFs and still preserve their contents as much as possible.
+
+OCRmyPDF also supports a many, many edge cases that have cropped over several years of development. We support PDF features like images inside of Form XObjects, and pages with UserUnit scaling. We support rare image formats like non-monochrome 1-bit images. Thanks to pikepdf and QPDF, we auto-repair PDFs that are damaged. (Not that you need to know what any of these are! You should be able to throw any PDF at it.)
+
+
+Limitations
+-----------
+
+OCRmyPDF is limited by the Tesseract OCR engine.  As such it experiences these limitations, as do any other programs that rely on Tesseract:
+
+* The OCR is not as accurate as commercial solutions such as Abbyy.
+* It is not capable of recognizing handwriting.
+* It may find gibberish and report this as OCR output.
+* If a document contains languages outside of those given in the ``-l LANG`` arguments, results may be poor.
+* It is not always good at analyzing the natural reading order of documents. For example, it may fail to recognize that a document contains two columns and join text across the columns.
+* Poor quality scans may produce poor quality OCR. Garbage in, garbage out.
+* It does not expose information about what font family text belongs to.
+
+OCRmyPDF is also limited by the PDF specification:
+
+* PDF encodes the position of text glyphs but does not encode document structure.  There is no markup that divides a document in sections, paragraphs, sentences, or even words (since blank spaces are not represented). As such all elements of document structure including the spaces between words must be derived heuristically.  Some PDF viewers do a better job of this than others.
+* Because some popular open source PDF viewers have a particularly hard time with spaces betweem words, OCRmyPDF appends a space to each text element as a workaround. While this mixes document structure with graphical information that ideally should be left to the PDF viewer to interpret, it improves compatibility with some viewers and does not cause problems for better ones.
+
+Ghostscript also imposes some limitations:
+
+* PDFs containing JBIG2-encoded content will be converted to CCITT Group4 encoding, which has lower compression ratios, if Ghostscript PDF/A is enabled.
+* PDFs containing JPEG 2000-encoded content will be converted to JPEG encoding, which may introduce compression artifacts, if Ghostscript PDF/A is enabled.
+* Ghostscript may transcode grayscale and color images, either lossy to lossless or lossless to lossy, based on an internal algorithm. This behavior can be suppressed by setting ``--pdfa-image-compression`` to ``jpeg`` or ``lossless`` to set all images to one type or the other. Ghostscript has no option to maintain the input image's format.
+
+Regarding OCRmyPDF itself:
+
+* PDFs that use transparency are not currently represented in the test suite
+* The Python API exported by ``import ocrmypdf`` is design to help scripts that use OCRmyPDF but is not currently capable of running OCRmyPDF jobs due to limitations in an underlying library.
+
+Similar programs
+----------------
+
+To the author's knowledge, OCRmyPDF is the most feature-rich and thoroughly tested command line OCR PDF conversion tool. If it does not meet your needs, contributions and suggestions are welcome. If not, consider one of these similar open source programs:
+
+* pdf2pdfocr
+* pdfsandwich
+* pypdfocr
+* pdfbeads
+
+Web front-ends
+--------------
+
+* `Nextcloud OCR <https://github.com/janis91/ocr>`_ is a free software plugin for the Nextcloud private cloud software
+* `OCRmyPDF-web <https://github.com/sseemayer/OCRmyPDF-web>`_, a micro web-frontend for OCRmyPDF (third-party, not actively maintained)
+
+Bear in mind that OCRmyPDF is not designed to be secure against malware-bearing PDFs (see `Using OCRmyPDF online`_).

docs/jbig2.rst

@@ -0,0 +1,35 @@
+.. _jbig2:
+
+Installing the JBIG2 encoder
+============================
+
+Most Linux distributions do not include a JBIG2 encoder since JBIG2 encoding was patented for a long time. All known JBIG2 US patents have expired as of 2017, but it is possible that unknown patents exist.
+
+JBIG2 encoding is recommended for OCRmyPDF and is used to losslessly create smaller PDFs. If JBIG2 encoding not available, lower quality encodings will be used.
+
+JBIG2 decoding is not patented and is performed automatically by most PDF viewers. It is widely supported has been part of the PDF specification since 2001.
+
+On macOS, Homebrew packages jbig2enc and OCRmyPDF includes it by default. The Docker image for OCRmyPDF also builds its own JBIG2 encoder from source.
+
+For all other Linux, you must build a JBIG2 encoder from source:
+
+.. code-block:: bash
+
+    git clone https://github.com/agl/jbig2enc
+    cd jbig2enc
+    ./autogen.sh
+    ./configure && make
+    [sudo] make install
+
+.. _jbig2-lossy:
+
+Lossy mode JBIG2
+----------------
+
+OCRmyPDF provides lossy mode JBIG2 as an advanced feature. Users should `review the technical concerns with JBIG2 in lossy mode <https://abbyy.technology/en:kb:tip:jbig2_compression_and_ocr>`_ and decide if this feature is acceptable for their use case.
+
+JBIG2 lossy mode does achieve higher compression ratios than any other monochrome (bitonal) compression technology; for large text documents the savings are considerable. JBIG2 lossless still gives great compression ratios and is a major improvement over the older CCITT G4 standard. As explained above, there is some risk of substitution errors.
+
+To turn on JBIG2 lossy mode, add the argument ``--jbig2-lossy``. ``--optimize {1,2,3}`` are necessary for the argument to take effect also required. Also, a JBIG2 encoder must be installed as described in the previous section.
+
+*ocrmypdf v7.0 and v7.1 used lossy mode by default.*

docs/languages.rst

@@ -0,0 +1,61 @@
+.. _lang-packs:
+
+Installing additional language packs
+====================================
+
+OCRmyPDF uses Tesseract for OCR, and relies on its language packs for languages other than English. 
+
+Tesseract supports `most languages <https://github.com/tesseract-ocr/tesseract/blob/master/doc/tesseract.1.asc#languages>`_.
+
+For Linux users, you can often find packages that provide language packs:
+
+Debian and Ubuntu users
+-----------------------
+
+.. code-block:: bash
+
+   # Display a list of all Tesseract language packs
+   apt-cache search tesseract-ocr
+
+   # Debian/Ubuntu users
+   apt-get install tesseract-ocr-chi-sim  # Example: Install Chinese Simplified language back
+   
+You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as to what languages it should search for. Multiple
+languages can be requested using either ``-l eng+fre`` (English and French) or ``-l eng -l fre``.
+
+macOS users
+-----------
+
+You can install additional language packs by :ref:`installing Tesseract using Homebrew with all language packs <macos-all-languages>`.
+
+Docker users
+------------
+
+Users of the Docker image may use the alternative :ref:`"polyglot" container <docker-polyglot>` which includes all languages.
+
+Adding individual language packs to a Docker image
+""""""""""""""""""""""""""""""""""""""""""""""""""
+
+If you wish to add a single language pack, you could do the following:
+
+* Download the desired ``.trainedata`` file from the `tessdata <https://github.com/tesseract-ocr/tessdata>`_ repository. Let's use Hebrew in this example (``heb.traineddata``)
+
+* Copy the file to ``/home/user/downloads/heb.traineddata``.
+
+* Create a new container based on the ocrmypdf-tess4 image and jump into it with a terminal:
+
+.. code-block:: bash
+
+	host$ docker run  -v /home/user/downloads:/home/docker -it --entrypoint /bin/bash ocrmypdf-tess4
+
+* Put the file where Tesseract expects it:
+
+.. code-block:: bash
+
+	docker$ cp /home/docker/heb.traineddata /usr/share/tesseract-ocr/tessdata
+
+* Note the container id, and save it as a new image (in this example, ``ocrmypdf-tess4-heb``)
+
+.. code-block:: bash
+
+    host$ docker commit <container_id> ocrmypdf-tess4-heb

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docs/release_notes.rst

@@ -0,0 +1,959 @@
+Release notes
+=============
+
+OCRmyPDF uses `semantic versioning <http://semver.org/>`_ for its command line interface and its public API.
+
+The ``ocrmypdf`` package may now be imported. The public API may be useful in scripts that launch OCRmyPDF processes or that wish to use some of its features for working with PDFs.
+
+Unfortunately, the public API does **not** expose the ability to actually OCR a PDF. This is due to a limitation in an underlying library (ruffus) that makes OCRmyPDF non-reentrant.
+
+Note that it is licensed under GPLv3, so scripts that ``import ocrmypdf`` and are released publicly should probably also be licensed under GPLv3.
+
+.. Issue regex
+   find:    [^`]\#([0-9]{1,3})[^0-9]
+   replace: `#$1 <https://github.com/jbarlow83/OCRmyPDF/issues/$1>`_
+
+
+v7.2.1
+------
+
+-   Fix compatibility with an API change in pikepdf 0.3.5.
+
+-   A kludge to support Leptonica versions older than 1.72 in the test suite was dropped. Older versions of Leptonica are likely still compatible. The only impact is that a portion of the test suite will be skipped.
+
+
+v7.2.0
+------
+
+**Lossy JBIG2 behavior change**
+
+A user reported that ocrmypdf was in fact using JBIG2 in **lossy** compression mode. This was not the intended behavior. Users should `review the technical concerns with JBIG2 in lossy mode <https://abbyy.technology/en:kb:tip:jbig2_compression_and_ocr>`_ and decide if this is a concern for their use case.
+
+JBIG2 lossy mode does achieve higher compression ratios than any other monochrome compression technology; for large text documents the savings are considerable. JBIG2 lossless still gives great compression ratios and is a major improvement over the older CCITT G4 standard.
+
+Only users who have reviewed the concerns with JBIG2 in lossy mode should opt-in. As such, lossy mode JBIG2 is only turned on when the new argument ``--jbig2-lossy`` is issued. This is independent of the setting for ``--optimize``.
+
+Users who did not install an optional JBIG2 encoder are unaffected.
+
+(Thanks to user 'bsdice' for reporting this issue.)
+
+**Other issues**
+
+-   When the image optimizer quantizes an image to 1 bit per pixel, it will now attempt to further optimize that image as CCITT or JBIG2, instead of keeping it in the "flate" encoding which is not efficient for 1 bpp images. (`#297 <https://github.com/jbarlow83/OCRmyPDF/issues/297>`_)
+
+-   Images in PDFs that are used as soft masks (i.e. transparency masks or alpha channels) are now excluded from optimization.
+
+-   Fixed handling of Tesseract 4.0-rc1 which now accepts invalid Tesseract configuration files, which broke the test suite.
+
+v7.1.0
+------
+
+-   Improve the performance of initial text extraction, which is done to determine if a file contains existing text of some kind or not. On large files, this initial processing is now about 20x times faster. (`#299 <https://github.com/jbarlow83/OCRmyPDF/issues/299>`_)
+
+-   pikepdf 0.3.3 is now required.
+
+-   Fixed issue `#231 <https://github.com/jbarlow83/OCRmyPDF/issues/231>`_, a problem with JPEG2000 images where image metadata was only available inside the JPEG2000 file.
+
+-   Fixed some additional Ghostscript 9.25 compatibility issues.
+
+-   Improved handling of KeyboardInterrupt error messages. (`#301 <https://github.com/jbarlow83/OCRmyPDF/issues/301>`_)
+
+-   README.md is now served in GitHub markdown instead of reStructuredText.
+
+v7.0.6
+------
+
+-   Blacklist Ghostscript 9.24, now that 9.25 is available and fixes many regressions in 9.24.
+
+
+v7.0.5
+------
+
+-   Improve capability with Ghostscript 9.24, and enable the JPEG passthrough feature when this version in installed.
+
+-   Ghostscript 9.24 lost the ability to set PDF title, author, subject and keyword metadata to Unicode strings. OCRmyPDF will set ASCII strings and warn when Unicode is suppressed. Other software may be used to update metadata. This is a short term work around.
+
+-   PDFs generated by Kodak Capture Desktop, or generally PDFs that contain indirect references to null objects in their table of contents, would have an invalid table of contents after processing by OCRmyPDF that might interfere with other viewers. This has been fixed.
+
+-   Detect PDFs generated by Adobe LiveCycle, which can only be displayed in Adobe Acrobat and Reader currently. When these are encountered, exit with an error instead of performing OCR on the "Please wait" error message page.
+
+v7.0.4
+------
+
+-   Fix exception thrown when trying to optimize a certain type of PNG embedded in a PDF with the ``-O2``
+
+-   Update to pikepdf 0.3.2, to gain support for optimizing some additional image types that were previously excluded from optimization (CMYK and grayscale). Fixes `#285 <https://github.com/jbarlow83/OCRmyPDF/issues/285>`_.
+
+v7.0.3
+------
+
+-   Fix issue `#284 <https://github.com/jbarlow83/OCRmyPDF/issues/284>`_, an error when parsing inline images that have are also image masks, by upgrading pikepdf to 0.3.1
+
+v7.0.2
+------
+
+-   Fix a regression with ``--rotate-pages`` on pages that already had rotations applied. (`#279 <https://github.com/jbarlow83/OCRmyPDF/issues/279>`_)
+
+-   Improve quality of page rotation in some cases by rasterizing a higher quality preview image. (`#281 <https://github.com/jbarlow83/OCRmyPDF/issues/281>`_)
+
+v7.0.1
+------
+
+-   Fix compatibility with img2pdf >= 0.3.0 by rejecting input images that have an alpha channel
+
+-   Add forward compatibility for pikepdf 0.3.0 (unrelated to img2pdf)
+
+-   Various documentation updates for v7.0.0 changes
+
+v7.0.0
+------
+
+-   The core algorithm for combining OCR layers with existing PDF pages has been rewritten and improved considerably.  PDFs are no longer split into single page PDFs for processing; instead, images are rendered and the OCR results are grafted onto the input PDF.  The new algorithm uses less temporary disk space and is much more performant especially for large files.
+
+-   New dependency: `pikepdf <https://github.com/pikepdf/pikepdf>`_. pikepdf is a powerful new Python PDF library driving the latest OCRmyPDF features, built on the QPDF C++ library (libqpdf).
+
+-   New feature: PDF optimization with ``-O`` or ``--optimize``.  After OCR, OCRmyPDF will perform image optimizations relevant to OCR PDFs.
+
+    +   If a JBIG2 encoder is available, then monochrome images will be converted, with the potential for huge savings on large black and white images, since JBIG2 is far more efficient than any other monochrome (bi-level) compression. (All known US patents related to JBIG2 have probably expired, but it remains the responsibility of the user to supply a JBIG2 encoder such as `jbig2enc <https://github.com/agl/jbig2enc>`_. OCRmyPDF does not implement JBIG2 encoding.)
+
+    +   If ``pngquant`` is installed, OCRmyPDF will optionally use it to perform lossy quantization and compression of PNG images.
+
+    +   The quality of JPEGs can also be lowered, on the assumption that a lower quality image may be suitable for storage after OCR.
+
+    +   This image optimization component will eventually be offered as an independent command line utility.
+
+    +   Optimization ranges from ``-O0`` through ``-O3``, where ``0`` disables optimization and ``3`` implements all options. ``1``, the default, performs only safe and lossless optimizations. (This is similar to GCC's optimization parameter.) The exact type of optimizations performed will vary over time.
+
+-   Small amounts of text in the margins of a page, such as watermarks, page numbers, or digital stamps, will no longer prevent the rest of a page from being OCRed when ``--skip-text`` is issued. This behavior is based on a heuristic.
+
+-   Removed features
+
+    +   The deprecated ``--pdf-renderer tesseract`` PDF renderer was removed.
+
+    +   ``-g``, the option to generate debug text pages, was removed because it was a maintenance burden and only worked in isolated cases. HOCR pages can still be previewed by running the hocrtransform.py with appropriate settings.
+
+-   Removed dependencies
+
+    +   ``PyPDF2``
+
+    +   ``defusedxml``
+
+    +   ``PyMuPDF``
+
+-   The ``sandwich`` PDF renderer can be used with all supported versions of Tesseract, including that those prior to v3.05 which don't support ``-c textonly``. (Tesseract v4.0.0 is recommended and more efficient.)
+
+-   ``--pdf-renderer auto`` option and the diagnostics used to select a PDF renderer now work better with old versions, but may make different decisions than past versions.
+
+-   If everything succeeds but PDF/A conversion fails, a distinct return code is now returned (``ExitCode.pdfa_conversion_failed (10)``) where this situation previously returned ``ExitCode.invalid_output_pdf (4)``. The latter is now returned only if there is some indication that the output file is invalid.
+
+-   Notes for downstream packagers
+
+    +   There is also a new dependency on ``python-xmp-toolkit`` which in turn depends on ``libexempi3``.
+
+    +   It may be necessary to separately ``pip install pycparser`` to avoid `another Python 3.7 issue <https://github.com/eliben/pycparser/pull/135>`_.
+
+v6.2.4
+------
+
+-   Backport Ghostscript 9.25 compatibility fixes, which removes support for setting Unicode metadata
+-   Backport blacklisting Ghostscript 9.24
+-   Older versions of Ghostscript are still supported
+
+v6.2.3
+------
+
+-   Fix compatibility with img2pdf >= 0.3.0 by rejecting input images that have an alpha channel
+-   This version will be included in Ubuntu 18.10
+
+v6.2.2
+------
+
+-   Backport compatibility fixes for Python 3.7 and ruffus 2.7.0 from v7.0.0
+-   Backport fix to ignore masks when deciding what colors are on a page
+-   Backport some minor improvements from v7.0.0: better argument validation and warnings about the Tesseract 4.0.0 ``--user-words`` regression
+
+v6.2.1
+------
+
+-   Fix recent versions of Tesseract (after 4.0.0-beta1) not being detected as supporting the ``sandwich`` renderer (`#271 <https://github.com/ppjbarlow83/OCRmyPDF/issues/271>`_).
+
+v6.2.0
+------
+
+-   **Docker**: The Docker image ``ocrmypdf-tess4`` has been removed. The main Docker images, ``ocrmypdf`` and ``ocrmypdf-polyglot`` now use Ubuntu 18.04 as a base image, and as such Tesseract 4.0.0-beta1 is now the Tesseract version they use. There is no Docker image based on Tesseract 3.05 anymore.
+
+-   Creation of PDF/A-3 is now supported. However, there is no ability to attach files to PDF/A-3.
+
+-   Lists more reasons why the file size might grow.
+
+-   Fix issue `#262 <https://github.com/ppjbarlow83/OCRmyPDF/issues/262>`_, ``--remove-background`` error on PDFs contained colormapped (paletted) images.
+
+-   Fix another XMP metadata validation issue, in cases where the input file's creation date has no timezone and the creation date is not overridden.
+
+
+v6.1.5
+------
+
+-   Fix issue `#253 <https://github.com/jbarlow83/OCRmyPDF/issues/253>`_, a possible division by zero when using the ``hocr`` renderer.
+
+-   Fix incorrectly formatted ``<xmp:ModifyDate>`` field inside XMP metadata for PDF/As.  veraPDF flags this as a PDF/A validation failure. The error is caused the timezone and final digit of the seconds of modified time to be omitted, so at worst the modification time stamp is rounded to the nearest 10 seconds.
+
+
+v6.1.4
+------
+
+-   Fix issue `#248 <https://github.com/jbarlow83/OCRmyPDF/issues/248>`_ ``--clean`` argument may remove OCR from left column of text on certain documents. We now set ``--layout none`` to suppress this.
+
+-   The test cache was updated to reflect the change above.
+
+-   Change test suite to accommodate Ghostscript 9.23's new ability to insert JPEGs into PDFs without transcoding.
+
+-   XMP metadata in PDFs is now examined using ``defusedxml`` for safety.
+
+-   If an external process exits with a signal when asked to report its version, we now print the system error message instead of suppressing it.  This occurred when the required executable was found but was missing a shared library.
+
+-   qpdf 7.0.0 or newer is now required as the test suite can no longer pass without it.
+
+Notes
+~~~~~
+
+-   An apparent `regression in Ghostscript 9.23 <https://bugs.ghostscript.com/show_bug.cgi?id=699216>`_ will cause some ocrmypdf output files to become invalid in rare cases; the workaround for the moment is to set ``--force-ocr``.
+
+
+v6.1.3
+------
+
+-   Fix issue `#247 <https://github.com/jbarlow83/OCRmyPDF/issues/247>`_, ``/CreationDate`` metadata not copied from input to output.
+
+-   A warning is now issued when Python 3.5 is used on files with a large page count, as this case is known to regress to single core performance. The cause of this problem is unknown.
+
+
+v6.1.2
+------
+
+-   Upgrade to PyMuPDF v1.12.5 which includes a more complete fix to `#239 <https://github.com/jbarlow83/OCRmyPDF/issues/239>`_.
+
+-   Add ``defusedxml`` dependency.
+
+
+v6.1.1
+------
+
+-   Fix text being reported as found on all pages if PyMuPDF is not installed.
+
+
+v6.1.0
+------
+
+-   PyMuPDF is now an optional but recommended dependency, to alleviate installation difficulties on platforms that have less access to PyMuPDF than the author anticipated.  (For version 6.x only) install OCRmyPDF with ``pip install ocrmypdf[fitz]`` to use it to its full potential.
+
+-   Fix ``FileExistsError`` that could occur if OCR timed out while it was generating the output file. (`#218 <https://github.com/jbarlow83/OCRmyPDF/issues/218>`_)
+
+-   Fix table of contents/bookmarks all being redirected to page 1 when generating a PDF/A (with PyMuPDF).  (Without PyMuPDF the table of contents is removed in PDF/A mode.)
+
+-   Fix "RuntimeError: invalid key in dict" when table of contents/bookmarks titles contained the character ``)``. (`#239 <https://github.com/jbarlow83/OCRmyPDF/issues/239>`_)
+
+-   Added a new argument ``--skip-repair`` to skip the initial PDF repair step if the PDF is already well-formed (because another program repaired it).
+
+
+v6.0.0
+------
+
+-   The software license has been changed to GPLv3. Test resource files and some individual sources may have other licenses.
+
+-   OCRmyPDF now depends on `PyMuPDF <https://pymupdf.readthedocs.io/en/latest/installation/>`_. Including PyMuPDF is the primary reason for the change to GPLv3.
+
+-   Other backward incompatible changes
+
+    + The ``OCRMYPDF_TESSERACT``, ``OCRMYPDF_QPDF``, ``OCRMYPDF_GS`` and ``OCRMYPDF_UNPAPER`` environment variables are no longer used. Change ``PATH`` if you need to override the external programs OCRmyPDF uses.
+
+    + The ``ocrmypdf`` package has been moved to ``src/ocrmypdf`` to avoid issues with accidental import.
+
+    + The function ``ocrmypdf.exec.get_program`` was removed.
+
+    + The deprecated module ``ocrmypdf.pageinfo`` was removed.
+
+    + The ``--pdf-renderer tess4`` alias for ``sandwich`` was removed.
+
+-   Fixed an issue where OCRmyPDF failed to detect existing text on pages, depending on how the text and fonts were encoded within the PDF. (`#233 <https://github.com/jbarlow83/OCRmyPDF/issues/233>`_, `#232 <https://github.com/jbarlow83/OCRmyPDF/issues/232>`_)
+
+-   Fixed an issue that caused dramatic inflation of file sizes when ``--skip-text --output-type pdf`` was used. OCRmyPDF now removes duplicate resources such as fonts, images and other objects that it generates. (`#237 <https://github.com/jbarlow83/OCRmyPDF/issues/237>`_)
+
+-   Improved performance of the initial page splitting step. Originally this step was not believed to be expensive and ran in a process. Large file testing revealed it to be a bottleneck, so it is now parallelized. On a 700 page file with quad core machine, this change saves about 2 minutes. (`#234 <https://github.com/jbarlow83/OCRmyPDF/issues/234>`_)
+
+-   The test suite now includes a cache that can be used to speed up test runs across platforms. This also does not require computing checksums, so it's faster. (`#217 <https://github.com/jbarlow83/OCRmyPDF/issues/217>`_)
+
+
+v5.7.0
+------
+
+-   Fixed an issue that caused poor CPU utilization on machines with more than 4 cores when running Tesseract 4. (Related to issue `#217 <https://github.com/jbarlow83/OCRmyPDF/issues/217>`_.)
+
+-   The 'hocr' renderer has been improved. The 'sandwich' and 'tesseract' renderers are still better for most use cases, but 'hocr' may be useful for people who work with the PDF.js renderer in English/ASCII languages. (`#225 <https://github.com/jbarlow83/OCRmyPDF/issues/225>`_)
+
+    + It now formats text in a matter that is easier for certain PDF viewers to select and extract copy and paste text. This should help macOS Preview and PDF.js in particular.
+    + The appearance of selected text and behavior of selecting text is improved.
+    + The PDF content stream now uses relative moves, making it more compact and easier for viewers to determine when two words on the same line.
+    + It can now deal with text on a skewed baseline.
+    + Thanks to @cforcey for the pull request, @jbreiden for many helpful suggestions, @ctbarbour for another round of improvements, and @acaloiaro for an independent review.
+
+v5.6.3
+------
+
+-   Suppress two debug messages that were too verbose
+
+
+v5.6.2
+------
+
+-   Development branch accidentally tagged as release. Do not use.
+
+
+v5.6.1
+------
+
+-   Fix issue `#219 <https://github.com/jbarlow83/OCRmyPDF/issues/219>`_: change how the final output file is created to avoid triggering permission errors when the output is a special file such as ``/dev/null``
+-   Fix test suite failures due to a qpdf 8.0.0 regression and Python 3.5's handling of symlink
+-   The "encrypted PDF" error message was different depending on the type of PDF encryption. Now a single clear message appears for all types of PDF encryption.
+-   ocrmypdf is now in Homebrew. Homebrew users are advised to the version of ocrmypdf in the official homebrew-core formulas rather than the private tap.
+-   Some linting
+
+
+v5.6.0
+------
+
+-   Fix issue `#216 <https://github.com/jbarlow83/OCRmyPDF/issues/216>`_: preserve "text as curves" PDFs without rasterizing file
+-   Related to the above, messages about rasterizing are more consistent
+-   For consistency versions minor releases will now get the trailing .0 they always should have had.
+
+
+v5.5
+----
+
+-   Add new argument ``--max-image-mpixels``. Pillow 5.0 now raises an exception when images may be decompression bombs. This argument can be used to override the limit Pillow sets.
+-   Fix output page cropped when using the sandwich renderer and OCR is skipped on a rotated and image-processed page
+-   A warning is now issued when old versions of Ghostscript are used in cases known to cause issues with non-Latin characters
+-   Fix a few parameter validation checks for ``-output-type pdfa-1`` and ``pdfa-2``
+
+
+v5.4.4
+------
+
+-   Fix issue `#181 <https://github.com/jbarlow83/OCRmyPDF/issues/181>`_: fix final merge failure for PDFs with more pages than the system file handle limit (``ulimit -n``)
+-   Fix issue `#200 <https://github.com/jbarlow83/OCRmyPDF/issues/200>`_: an uncommon syntax for formatting decimal numbers in a PDF would cause qpdf to issue a warning, which ocrmypdf treated as an error. Now this the warning is relayed.
+-   Fix an issue where intermediate PDFs would be created at version 1.3 instead of the version of the original file. It's possible but unlikely this had side effects.
+-   A warning is now issued when older versions of qpdf are used since issues like `#200 <https://github.com/jbarlow83/OCRmyPDF/issues/200>`_ cause qpdf to infinite-loop
+-   Address issue `#140 <https://github.com/jbarlow83/OCRmyPDF/issues/140>`_: if Tesseract outputs invalid UTF-8, escape it and print its message instead of aborting with a Unicode error
+-   Adding previously unlisted setup requirement, pytest-runner
+-   Update documentation: fix an error in the example script for Synology with Docker images, improved security guidance, advised ``pip install --user``
+
+
+v5.4.3
+------
+
+-   If a subprocess fails to report its version when queried, exit cleanly with an error instead of throwing an exception
+-   Added test to confirm that the system locale is Unicode-aware and fail early if it's not
+-   Clarified some copyright information
+-   Updated pinned requirements.txt so the homebrew formula captures more recent versions
+
+
+v5.4.2
+------
+
+-   Fixed a regression from v5.4.1 that caused sidecar files to be created as empty files
+
+
+v5.4.1
+------
+
+-   Add workaround for Tesseract v4.00alpha crash when trying to obtain orientation and the latest language packs are installed
+
+
+v5.4
+----
+
+-   Change wording of a deprecation warning to improve clarity
+-   Added option to generate PDF/A-1b output if desired (``--output-type pdfa-1``); default remains PDF/A-2b generation
+-   Update documentation
+
+
+v5.3.3
+------
+
+-   Fixed missing error message that should occur when trying to force ``--pdf-renderer sandwich`` on old versions of Tesseract
+-   Update copyright information in test files
+-   Set system ``LANG`` to UTF-8 in Dockerfiles to avoid UTF-8 encoding errors
+
+
+v5.3.2
+------
+
+-   Fixed a broken test case related to language packs
+
+
+v5.3.1
+------
+
+-   Fixed wrong return code given for missing Tesseract language packs
+-   Fixed "brew audit" crashing on Travis when trying to auto-brew
+
+
+v5.3
+----
+
+-   Added ``--user-words`` and ``--user-patterns`` arguments which are forwarded to Tesseract OCR as words and regular expressions respective to use to guide OCR. Supplying a list of subject-domain words should assist Tesseract with resolving words. (`#165 <https://github.com/jbarlow83/OCRmyPDF/issues/165>`_)
+-   Using a non Latin-1 language with the "hocr" renderer now warns about possible OCR quality and recommends workarounds (`#176 <https://github.com/jbarlow83/OCRmyPDF/issues/176>`_)
+-   Output file path added to error message when that location is not writable (`#175 <https://github.com/jbarlow83/OCRmyPDF/issues/175>`_)
+-   Otherwise valid PDFs with leading whitespace at the beginning of the file are now accepted
+
+
+v5.2
+----
+
+-   When using Tesseract 3.05.01 or newer, OCRmyPDF will select the "sandwich" PDF renderer by default, unless another PDF renderer is specified with the ``--pdf-renderer`` argument. The previous behavior was to select ``--pdf-renderer=hocr``.
+-   The "tesseract" PDF renderer is now deprecated, since it can cause problems with Ghostscript on Tesseract 3.05.00
+-   The "tess4" PDF renderer has been renamed to "sandwich". "tess4" is now a deprecated alias for "sandwich".
+
+
+v5.1
+----
+
+-   Files with pages larger than 200" (5080 mm) in either dimension are now supported with ``--output-type=pdf`` with the page size preserved (in the PDF specification this feature is called UserUnit scaling). Due to Ghostscript limitations this is not available in conjunction with PDF/A output.
+
+
+v5.0.1
+------
+
+-   Fixed issue `#169 <https://github.com/jbarlow83/OCRmyPDF/issues/169>`_, exception due to failure to create sidecar text files on some versions of Tesseract 3.04, including the jbarlow83/ocrmypdf Docker image
+
+v5.0
+----
+
+-   Backward incompatible changes
+
+     + Support for Python 3.4 dropped. Python 3.5 is now required.
+     + Support for Tesseract 3.02 and 3.03 dropped. Tesseract 3.04 or newer is required. Tesseract 4.00 (alpha) is supported.
+     + The OCRmyPDF.sh script was removed.
+
+-   Add a new feature, ``--sidecar``, which allows creating "sidecar" text files which contain the OCR results in plain text. These OCR text is more reliable than extracting text from PDFs. Closes `#126 <https://github.com/jbarlow83/OCRmyPDF/issues/126>`_.
+-   New feature: ``--pdfa-image-compression``, which allows overriding Ghostscript's lossy-or-lossless image encoding heuristic and making all images JPEG encoded or lossless encoded as desired. Fixes `#163 <https://github.com/jbarlow83/OCRmyPDF/issues/163>`_.
+-   Fixed issue `#143 <https://github.com/jbarlow83/OCRmyPDF/issues/143>`_, added ``--quiet`` to suppress "INFO" messages
+-   Fixed issue `#164 <https://github.com/jbarlow83/OCRmyPDF/issues/164>`_, a typo
+-   Removed the command line parameters ``-n`` and ``--just-print`` since they have not worked for some time (reported as Ubuntu bug `#1687308 <https://bugs.launchpad.net/ubuntu/+source/ocrmypdf/+bug/1687308>`_)
+
+v4.5.6
+------
+
+-   Fixed issue `#156 <https://github.com/jbarlow83/OCRmyPDF/issues/156>`_, 'NoneType' object has no attribute 'getObject' on pages with no optional /Contents record.  This should resolve all issues related to pages with no /Contents record.
+-   Fixed issue `#158 <https://github.com/jbarlow83/OCRmyPDF/issues/158>`_, ocrmypdf now stops and terminates if Ghostscript fails on an intermediate step, as it is not possible to proceed.
+-   Fixed issue `#160 <https://github.com/jbarlow83/OCRmyPDF/issues/160>`_, exception thrown on certain invalid arguments instead of error message
+
+v4.5.5
+------
+
+-   Automated update of macOS homebrew tap
+-   Fixed issue `#154 <https://github.com/jbarlow83/OCRmyPDF/issues/154>`_, KeyError '/Contents' when searching for text on blank pages that have no /Contents record.  Note: incomplete fix for this issue.
+
+v4.5.4
+------
+
+-   Fix ``--skip-big`` raising an exception if a page contains no images (`#152 <https://github.com/jbarlow83/OCRmyPDF/issues/152>`_) (thanks to @TomRaz)
+-   Fix an issue where pages with no images might trigger "cannot write mode P as JPEG" (`#151 <https://github.com/jbarlow83/OCRmyPDF/issues/151>`_)
+
+v4.5.3
+------
+
+-   Added a workaround for Ghostscript 9.21 and probably earlier versions would fail with the error message "VMerror -25", due to a Ghostscript bug in XMP metadata handling
+-   High Unicode characters (U+10000 and up) are no longer accepted for setting metadata on the command line, as Ghostscript may not handle them correctly.
+-   Fixed an issue where the ``tess4`` renderer would duplicate content onto output pages if tesseract failed or timed out
+-   Fixed ``tess4`` renderer not recognized when lossless reconstruction is possible
+
+v4.5.2
+------
+
+-   Fix issue `#147 <https://github.com/jbarlow83/OCRmyPDF/issues/147>`_. ``--pdf-renderer tess4 --clean`` will produce an oversized page containing the original image in the bottom left corner, due to loss DPI information.
+-   Make "using Tesseract 4.0" warning less ominous
+-   Set up machinery for homebrew OCRmyPDF tap
+
+v4.5.1
+------
+
+-   Fix issue `#137 <https://github.com/jbarlow83/OCRmyPDF/issues/137>`_, proportions of images with a non-square pixel aspect ratio would be distorted in output for ``--force-ocr`` and some other combinations of flags
+
+v4.5
+----
+
+-   PDFs containing "Form XObjects" are now supported (issue `#134 <https://github.com/jbarlow83/OCRmyPDF/issues/134>`_; PDF reference manual 8.10), and images they contain are taken into account when determining the resolution for rasterizing
+-   The Tesseract 4 Docker image no longer includes all languages, because it took so long to build something would tend to fail
+-   OCRmyPDF now warns about using ``--pdf-renderer tesseract`` with Tesseract 3.04 or lower due to issues with Ghostscript corrupting the OCR text in these cases
+
+v4.4.2
+------
+
+-   The Docker images (ocrmypdf, ocrmypdf-polyglot, ocrmypdf-tess4) are now based on Ubuntu 16.10 instead of Debian stretch
+
+    + This makes supporting the Tesseract 4 image easier
+    + This could be a disruptive change for any Docker users who built customized these images with their own changes, and made those changes in a way that depends on Debian and not Ubuntu
+
+-   OCRmyPDF now prevents running the Tesseract 4 renderer with Tesseract 3.04, which was permitted in v4.4 and v4.4.1 but will not work
+
+v4.4.1
+------
+
+-   To prevent a `TIFF output error <https://github.com/python-pillow/Pillow/issues/2206>`_ caused by img2pdf >= 0.2.1 and Pillow <= 3.4.2, dependencies have been tightened
+-   The Tesseract 4.00 simultaneous process limit was increased from 1 to 2, since it was observed that 1 lowers performance
+-   Documentation improvements to describe the ``--tesseract-config`` feature
+-   Added test cases and fixed error handling for ``--tesseract-config``
+-   Tweaks to setup.py to deal with issues in the v4.4 release
+
+v4.4
+----
+
+-   Tesseract 4.00 is now supported on an experimental basis.
+
+    +  A new rendering option ``--pdf-renderer tess4`` exploits Tesseract 4's new text-only output PDF mode. See the documentation on PDF Renderers for details.
+    +  The ``--tesseract-oem`` argument allows control over the Tesseract 4 OCR engine mode (tesseract's ``--oem``). Use ``--tesseract-oem 2`` to enforce the new LSTM mode.
+    +  Fixed poor performance with Tesseract 4.00 on Linux
+
+-   Fixed an issue that caused corruption of output to stdout in some cases
+-   Removed test for Pillow JPEG and PNG support, as the minimum supported version of Pillow now enforces this
+-   OCRmyPDF now tests that the intended destination file is writable before proceeding
+-   The test suite now requires ``pytest-helpers-namespace`` to run (but not install)
+-   Significant code reorganization to make OCRmyPDF re-entrant and improve performance. All changes should be backward compatible for the v4.x series.
+
+    + However, OCRmyPDF's dependency "ruffus" is not re-entrant, so no Python API is available. Scripts should continue to use the command line interface.
+
+v4.3.5
+------
+
+-   Update documentation to confirm Python 3.6.0 compatibility. No code changes were needed, so many earlier versions are likely supported.
+
+v4.3.4
+------
+
+-   Fixed "decimal.InvalidOperation: quantize result has too many digits" for high DPI images
+
+v4.3.3
+------
+
+-   Fixed PDF/A creation with Ghostscript 9.20 properly
+-   Fixed an exception on inline stencil masks with a missing optional parameter
+
+v4.3.2
+------
+
+-   Fixed a PDF/A creation issue with Ghostscript 9.20 (note: this fix did not actually work)
+
+v4.3.1
+------
+
+-   Fixed an issue where pages produced by the "hocr" renderer after a Tesseract timeout would be rotated incorrectly if the input page was rotated with a /Rotate marker
+-   Fixed a file handle leak in LeptonicaErrorTrap that would cause a "too many open files" error for files around hundred pages of pages long when ``--deskew`` or ``--remove-background`` or other Leptonica based image processing features were in use, depending on the system value of ``ulimit -n``
+-   Ability to specify multiple languages for multilingual documents is now advertised in documentation
+-   Reduced the file sizes of some test resources
+-   Cleaned up debug output
+-   Tesseract caching in test cases is now more cautious about false cache hits and reproducing exact output, not that any problems were observed
+
+v4.3
+----
+
+-   New feature ``--remove-background`` to detect and erase the background of color and grayscale images
+-   Better documentation
+-   Fixed an issue with PDFs that draw images when the raster stack depth is zero
+-   ocrmypdf can now redirect its output to stdout for use in a shell pipeline
+
+    +  This does not improve performance since temporary files are still used for buffering
+    +  Some output validation is disabled in this mode
+
+v4.2.5
+------
+
+-   Fixed an issue (`#100 <https://github.com/jbarlow83/OCRmyPDF/issues/100>`_) with PDFs that omit the optional /BitsPerComponent parameter on images
+-   Removed non-free file milk.pdf
+
+v4.2.4
+------
+
+-   Fixed an error (`#90 <https://github.com/jbarlow83/OCRmyPDF/issues/90>`_) caused by PDFs that use stencil masks properly
+-   Fixed handling of PDFs that try to draw images or stencil masks without properly setting up the graphics state (such images are now ignored for the purposes of calculating DPI)
+
+v4.2.3
+------
+
+-   Fixed an issue with PDFs that store page rotation (/Rotate) in an indirect object
+-   Integrated a few fixes to simplify downstream packaging (Debian)
+
+    +  The test suite no longer assumes it is installed
+    +  If running Linux, skip a test that passes Unicode on the command line
+
+-   Added a test case to check explicit masks and stencil masks
+-   Added a test case for indirect objects and linearized PDFs
+-   Deprecated the OCRmyPDF.sh shell script
+
+v4.2.2
+------
+
+-   Improvements to documentation
+
+v4.2.1
+------
+
+-   Fixed an issue where PDF pages that contained stencil masks would report an incorrect DPI and cause Ghostscript to abort
+-   Implemented stdin streaming
+
+v4.2
+----
+
+-   ocrmypdf will now try to convert single image files to PDFs if they are provided as input (`#15 <https://github.com/jbarlow83/OCRmyPDF/issues/15>`_)
+
+    +  This is a basic convenience feature. It only supports a single image and always makes the image fill the whole page.
+    +  For better control over image to PDF conversion, use ``img2pdf`` (one of ocrmypdf's dependencies)
+
+-   New argument ``--output-type {pdf|pdfa}`` allows disabling Ghostscript PDF/A generation
+
+    +  ``pdfa`` is the default, consistent with past behavior
+    +  ``pdf`` provides a workaround for users concerned about the increase in file size from Ghostscript forcing JBIG2 images to CCITT and transcoding JPEGs
+    +  ``pdf`` preserves as much as it can about the original file, including problems that PDF/A conversion fixes
+
+-   PDFs containing images with "non-square" pixel aspect ratios, such as 200x100 DPI, are now handled and converted properly (fixing a bug that caused to be cropped)
+-   ``--force-ocr`` rasterizes pages even if they contain no images
+
+    +  supports users who want to use OCRmyPDF to reconstruct text information in PDFs with damaged Unicode maps (copy and paste text does not match displayed text)
+    +  supports reinterpreting PDFs where text was rendered as curves for printing, and text needs to be recovered
+    +  fixes issue `#82 <https://github.com/jbarlow83/OCRmyPDF/issues/82>`_
+
+-   Fixes an issue where, with certain settings, monochrome images in PDFs would be converted to 8-bit grayscale, increasing file size (`#79 <https://github.com/jbarlow83/OCRmyPDF/issues/79>`_)
+-   Support for Ubuntu 12.04 LTS "precise" has been dropped in favor of (roughly) Ubuntu 14.04 LTS "trusty"
+
+    +  Some Ubuntu "PPAs" (backports) are needed to make it work
+
+-   Support for some older dependencies dropped
+
+    +  Ghostscript 9.15 or later is now required (available in Ubuntu trusty with backports)
+    +  Tesseract 3.03 or later is now required (available in Ubuntu trusty)
+
+-   Ghostscript now runs in "safer" mode where possible
+
+v4.1.4
+------
+
+-   Bug fix: monochrome images with an ICC profile attached were incorrectly converted to full color images if lossless reconstruction was not possible due to other settings; consequence was increased file size for these images
+
+v4.1.3
+------
+
+-   More helpful error message for PDFs with version 4 security handler
+-   Update usage instructions for Windows/Docker users
+-   Fix order of operations for matrix multiplication (no effect on most users)
+-   Add a few leptonica wrapper functions (no effect on most users)
+
+v4.1.2
+------
+
+-   Replace IEC sRGB ICC profile with Debian's sRGB (from icc-profiles-free) which is more compatible with the MIT license
+-   More helpful error message for an error related to certain types of malformed PDFs
+
+v4.1
+----
+
+-   ``--rotate-pages`` now only rotates pages when reasonably confidence in the orientation. This behavior can be adjusted with the new argument ``--rotate-pages-threshold``
+-   Fixed problems in error checking if ``unpaper`` is uninstalled or missing at run-time
+-   Fixed problems with "RethrownJobError" errors during error handling that suppressed the useful error messages
+
+v4.0.7
+------
+
+-   Minor correction to Ghostscript output settings
+
+v4.0.6
+------
+
+-   Update install instructions
+-   Provide a sRGB profile instead of using Ghostscript's
+
+v4.0.5
+------
+
+-   Remove some verbose debug messages from v4.0.4
+-   Fixed temporary that wasn't being deleted
+-   DPI is now calculated correctly for cropped images, along with other image transformations
+-   Inline images are now checked during DPI calculation instead of rejecting the image
+
+v4.0.4
+------
+
+Released with verbose debug message turned on. Do not use. Skip to v4.0.5.
+
+v4.0.3
+------
+
+New features
+
+-   Page orientations detected are now reported in a summary comment
+
+Fixes
+
+-   Show stack trace if unexpected errors occur
+-   Treat "too few characters" error message from Tesseract as a reason to skip that page rather than
+    abort the file
+-   Docker: fix blank JPEG2000 issue by insisting on Ghostscript versions that have this fixed
+
+
+v4.0.2
+------
+
+Fixes
+
+
+-   Fixed compatibility with Tesseract 3.04.01 release, particularly its different way of outputting
+    orientation information
+-   Improved handling of Tesseract errors and crashes
+-   Fixed use of chmod on Docker that broke most test cases
+
+
+v4.0.1
+------
+
+Fixes
+
+
+-   Fixed a KeyError if tesseract fails to find page orientation information
+
+
+v4.0
+----
+
+New features
+
+-   Automatic page rotation (``-r``) is now available. It uses ignores any prior rotation information
+    on PDFs and sets rotation based on the dominant orientation of detectable text. This feature is
+    fairly reliable but some false positives occur especially if there is not much text to work with. (`#4 <https://github.com/jbarlow83/OCRmyPDF/issues/4>`_)
+-   Deskewing is now performed using Leptonica instead of unpaper. Leptonica is faster and more reliable
+    at image deskewing than unpaper.
+
+
+Fixes
+
+-   Fixed an issue where lossless reconstruction could cause some pages to be appear incorrectly
+    if the page was rotated by the user in Acrobat after being scanned (specifically if it a /Rotate tag)
+-   Fixed an issue where lossless reconstruction could misalign the graphics layer with respect to
+    text layer if the page had been cropped such that its origin is not (0, 0) (`#49 <https://github.com/jbarlow83/OCRmyPDF/issues/49>`_)
+
+
+Changes
+
+-   Logging output is now much easier to read
+-   ``--deskew`` is now performed by Leptonica instead of unpaper (`#25 <https://github.com/jbarlow83/OCRmyPDF/issues/25>`_)
+-   libffi is now required
+-   Some changes were made to the Docker and Travis build environments to support libffi
+-   ``--pdf-renderer=tesseract`` now displays a warning if the Tesseract version is less than 3.04.01,
+    the planned release that will include fixes to an important OCR text rendering bug in Tesseract 3.04.00.
+    You can also manually install ./share/sharp2.ttf on top of pdf.ttf in your Tesseract tessdata folder
+    to correct the problem.
+
+
+v3.2.1
+------
+
+Changes
+
+-   Fixed issue `#47 <https://github.com/jbarlow83/OCRmyPDF/issues/47>`_ "convert() got and unexpected keyword argument 'dpi'" by upgrading to img2pdf 0.2
+-   Tweaked the Dockerfiles
+
+
+v3.2
+----
+
+New features
+
+-   Lossless reconstruction: when possible, OCRmyPDF will inject text layers without
+    otherwise manipulating the content and layout of a PDF page. For example, a PDF containing a mix
+    of vector and raster content would see the vector content preserved. Images may still be transcoded
+    during PDF/A conversion.  (``--deskew`` and ``--clean-final`` disable this mode, necessarily.)
+-   New argument ``--tesseract-pagesegmode`` allows you to pass page segmentation arguments to Tesseract OCR.
+    This helps for two column text and other situations that confuse Tesseract.
+-   Added a new "polyglot" version of the Docker image, that generates Tesseract with all languages packs installed,
+    for the polyglots among us. It is much larger.
+
+Changes
+
+-   JPEG transcoding quality is now 95 instead of the default 75. Bigger file sizes for less degradation.
+
+
+
+v3.1.1
+------
+
+Changes
+
+-   Fixed bug that caused incorrect page size and DPI calculations on documents with mixed page sizes
+
+v3.1
+----
+
+Changes
+
+-   Default output format is now PDF/A-2b instead of PDF/A-1b
+-   Python 3.5 and macOS El Capitan are now supported platforms - no changes were
+    needed to implement support
+-   Improved some error messages related to missing input files
+-   Fixed issue `#20 <https://github.com/jbarlow83/OCRmyPDF/issues/20>`_ - uppercase .PDF extension not accepted
+-   Fixed an issue where OCRmyPDF failed to text that certain pages contained previously OCR'ed text,
+    such as OCR text produced by Tesseract 3.04
+-   Inserts /Creator tag into PDFs so that errors can be traced back to this project
+-   Added new option ``--pdf-renderer=auto``, to let OCRmyPDF pick the best PDF renderer.
+    Currently it always chooses the 'hocrtransform' renderer but that behavior may change.
+-   Set up Travis CI automatic integration testing
+
+v3.0
+----
+
+New features
+
+-   Easier installation with a Docker container or Python's ``pip`` package manager
+-   Eliminated many external dependencies, so it's easier to setup
+-   Now installs ``ocrmypdf`` to ``/usr/local/bin`` or equivalent for system-wide
+    access and easier typing
+-   Improved command line syntax and usage help (``--help``)
+-   Tesseract 3.03+ PDF page rendering can be used instead for better positioning
+    of recognized text (``--pdf-renderer tesseract``)
+-   PDF metadata (title, author, keywords) are now transferred to the
+    output PDF
+-   PDF metadata can also be set from the command line (``--title``, etc.)
+-   Automatic repairs malformed input PDFs if possible
+-   Added test cases to confirm everything is working
+-   Added option to skip extremely large pages that take too long to OCR and are
+    often not OCRable (e.g. large scanned maps or diagrams); other pages are still
+    processed (``--skip-big``)
+-   Added option to kill Tesseract OCR process if it seems to be taking too long on
+    a page, while still processing other pages (``--tesseract-timeout``)
+-   Less common colorspaces (CMYK, palette) are now supported by conversion to RGB
+-   Multiple images on the same PDF page are now supported
+
+Changes
+
+-   New, robust rewrite in Python 3.4+ with ruffus_ pipelines
+-   Now uses Ghostscript 9.14's improved color conversion model to preserve PDF colors
+-   OCR text is now rendered in the PDF as invisible text. Previous versions of OCRmyPDF
+    incorrectly rendered visible text with an image on top.
+-   All "tasks" in the pipeline can be executed in parallel on any
+    available CPUs, increasing performance
+-   The ``-o DPI`` argument has been phased out, in favor of ``--oversample DPI``, in
+    case we need ``-o OUTPUTFILE`` in the future
+-   Removed several dependencies, so it's easier to install.  We no
+    longer use:
+
+    - GNU parallel_
+    - ImageMagick_
+    - Python 2.7
+    - Poppler
+    - MuPDF_ tools
+    - shell scripts
+    - Java and JHOVE_
+    - libxml2
+
+-   Some new external dependencies are required or optional, compared to v2.x:
+
+    - Ghostscript 9.14+
+    - qpdf_ 5.0.0+
+    - Unpaper_ 6.1 (optional)
+    - some automatically managed Python packages
+
+.. _ruffus: http://www.ruffus.org.uk/index.html
+.. _parallel: https://www.gnu.org/software/parallel/
+.. _ImageMagick: http://www.imagemagick.org/script/index.php
+.. _MuPDF: http://mupdf.com/docs/
+.. _qpdf: http://qpdf.sourceforge.net/
+.. _Unpaper: https://github.com/Flameeyes/unpaper
+.. _JHOVE: http://jhove.sourceforge.net/
+
+Release candidates^
+
+-   rc9:
+
+    - fix issue `#118 <https://github.com/jbarlow83/OCRmyPDF/issues/118>`_: report error if ghostscript iccprofiles are missing
+    - fixed another issue related to `#111 <https://github.com/jbarlow83/OCRmyPDF/issues/111>`_: PDF rasterized to palette file
+    - add support image files with a palette
+    - don't try to validate PDF file after an exception occurs
+
+-   rc8:
+
+    - fix issue `#111 <https://github.com/jbarlow83/OCRmyPDF/issues/111>`_: exception thrown if PDF is missing DocumentInfo dictionary
+
+-   rc7:
+
+    - fix error when installing direct from pip, "no such file 'requirements.txt'"
+
+-   rc6:
+
+    - dropped libxml2 (Python lxml) since Python 3's internal XML parser is sufficient
+    - set up Docker container
+    - fix Unicode errors if recognized text contains Unicode characters and system locale is not UTF-8
+
+-   rc5:
+
+    - dropped Java and JHOVE in favour of qpdf
+    - improved command line error output
+    - additional tests and bug fixes
+    - tested on Ubuntu 14.04 LTS
+
+-   rc4:
+
+    - dropped MuPDF in favour of qpdf
+    - fixed some installer issues and errors in installation instructions
+    - improve performance: run Ghostscript with multithreaded rendering
+    - improve performance: use multiple cores by default
+    - bug fix: checking for wrong exception on process timeout
+
+-   rc3: skipping version number intentionally to avoid confusion with Tesseract
+-   rc2: first release for public testing to test-PyPI, Github
+-   rc1: testing release process
+
+Compatibility notes
+-------------------
+
+-   ``./OCRmyPDF.sh`` script is still available for now
+-   Stacking the verbosity option like ``-vvv`` is no longer supported
+
+-   The configuration file ``config.sh`` has been removed.  Instead, you can
+    feed a file to the arguments for common settings:
+
+::
+
+    ocrmypdf input.pdf output.pdf @settings.txt
+
+where ``settings.txt`` contains *one argument per line*, for example:
+
+::
+
+    -l
+    deu
+    --author
+    A. Merkel
+    --pdf-renderer
+    tesseract
+
+
+Fixes
+
+
+-   Handling of filenames containing spaces: fixed
+
+Notes and known issues
+
+-   Some dependencies may work with lower versions than tested, so try
+    overriding dependencies if they are "in the way" to see if they work.
+
+-   ``--pdf-renderer tesseract`` will output files with an incorrect page size in Tesseract 3.03,
+    due to a bug in Tesseract.
+
+-   PDF files containing "inline images" are not supported and won't be for the 3.0 release. Scanned
+    images almost never contain inline images.
+
+
+v2.2-stable (2014-09-29)
+------------------------
+
+OCRmyPDF versions 1 and 2 were implemented as shell scripts. OCRmyPDF 3.0+ is a fork that gradually replaced all shell scripts with Python while maintaining the existing command line arguments. No one is maintaining old versions.
+
+For details on older versions, see the `final version of its release notes <https://github.com/fritz-hh/OCRmyPDF/blob/7fd3dbdf42ca53a619412ce8add7532c5e81a9d1/RELEASE_NOTES.md>`_.

docs/security.rst

@@ -0,0 +1,77 @@
+PDF security issues
+===================
+
+	OCRmyPDF should only be used on PDFs you trust. It is not designed to protect you against malware.
+
+Recognizing that many users have an interest in handling PDFs and applying OCR to PDFs they did not generate themselves, this article discusses the security implications of PDFs and how users can protect themselves.
+
+The disclaimer applies: this software has no warranties of any kind.
+
+PDFs may contain malware
+------------------------
+
+PDF is a rich, complex file format. The official PDF 1.7 specification, ISO 32000:2008, is hundreds of pages long and references several annexes each of which are similar in length. PDFs can contain video, audio, XML, JavaScript and other programming, and forms. In some cases, they can open internet connections to pre-selected URLs. All of these possible attack vectors.
+
+In short, PDFs `may contain viruses <https://security.stackexchange.com/questions/64052/can-a-pdf-file-contain-a-virus>`_.
+
+This `article <https://theinvisiblethings.blogspot.ca/2013/02/converting-untrusted-pdfs-into-trusted.html>`_ describes a high-paranoia method which allows potentially hostile PDFs to be viewed and rasterized safely in a disposable virtual machine. A trusted PDF created in this manner is converted to images and loses all information making it searchable and losing all compression. OCRmyPDF could be used restore searchability.
+
+How OCRmyPDF processes PDFs
+---------------------------
+
+OCRmyPDF must open and interpret your PDF in order to insert an OCR layer. First, it runs all PDFs through `pikepdf <https://github.com/pikepdf/pikepdf>`_, a library based on `qpdf <https://github.com/qpdf/qpdf>`_, a program that repairs PDFs with syntax errors. This is done because, in the author's experience, a significant number of PDFs in the wild especially those created by scanners are not well-formed files. qpdf makes it more likely that OCRmyPDF will succeed, but offers no security guarantees. qpdf is also used to split the PDF into single page PDFs.
+
+Finally, OCRmyPDF rasterizes each page of the PDF using `Ghostscript <http://ghostscript.com/>`_ in ``-dSAFER`` mode.
+
+Depending on the options specified, OCRmyPDF may graft the OCR layer into the existing PDF or it may essentially reconstruct ("re-fry") a visually identical PDF that may be quite different at the binary level. That said, OCRmyPDF is not a tool designed for sanitizing PDFs.
+
+Using OCRmyPDF online or as a service
+-------------------------------------
+
+OCRmyPDF should not be deployed as a public-facing service, such as a website where a potential attacker could upload a PDF of their choice for OCR. OCRmyPDF is not designed to be secure against PDF malware. Another concern is PDFs specifically designed to be a denial of service attack: PDFs can contain recursive data structures that sometimes send parsers into infinite loops, and issue complex graphics drawing commands.
+
+Setting aside these concerns, a side effect of OCRmyPDF is it may incidentally sanitize PDFs that contain malware. It runs ``qpdf`` to repair the PDF, which could correct malformed PDF structures that are part of an attack. When PDF/A output is selected (the default), the input PDF is partially reconstructed by Ghostscript. When ``--force-ocr`` is used, all pages are rasterized and reconverted to PDF, which could remove malware in embedded images. No guarantees.
+
+OCRmyPDF should be relatively safe to use in a trusted intranet, with some considerations:
+
+Limiting CPU usage
+^^^^^^^^^^^^^^^^^^
+
+OCRmyPDF will attempt to use all available CPUs and storage, so executing ``nice ocrmypdf`` or limiting the number of jobs with the ``-j`` argument may ensure the server remains available. Another option would be run OCRmyPDF jobs inside a Docker container, a virtual machine, or a cloud instance, which can impose its own limits on CPU usage and be terminated "from orbit" if it fails to complete.
+
+Temporary storage requirements
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+OCRmyPDF will use a large amount of temporary storage for its work, proportional to the total number of pixels needed to rasterize the PDF. The raster image of a 8.5×11" color page at 300 DPI takes 25 MB uncompressed; OCRmyPDF saves its intermediates as PNG, but that still means it requires about 9 MB per intermediate based on average compression ratios. Multiple intermediates per page are also required, depending on the command line given. A rule of thumb would be to allow 100 MB of temporary storage per page in a file – meaning that a small cloud servers or small VM partitions should be provisioned with plenty of extra space, if say, a 500 page file might be sent.
+
+To check temporary storage usage on actual files, run ``ocrmypdf -k ...`` which will preserve and print the path to temporary storage when the job is done.
+
+To change where temporary files are stored, change the ``TMPDIR`` environment variable for ocrmypdf's environment. (Python's ``tempfile.gettempdir()`` returns the root directory in which temporary files will be stored.) For example, one could redirect ``TMPDIR`` to a large RAM disk to avoid wear on HDD/SSD and potentially improve performance. On Amazon Web Services, ``TMPDIR`` can be set to `empheral storage <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html>`_.
+
+Timeouts
+^^^^^^^^
+
+To prevent excessively long OCR jobs consider setting ``--tesseract-timeout`` and/or ``--skip-big`` arguments. ``--skip-big`` is particularly helpful if your PDFs include documents such as reports on standard page sizes with large images attached - often large images are not worth OCR'ing anyway.
+
+Commercial alternatives
+^^^^^^^^^^^^^^^^^^^^^^^
+
+The author also provides professional services that include OCR and building databases around PDFs, and is happy to provide consultation.
+
+Abbyy Cloud OCR is a viable commercial alternative with a web services API.
+
+
+Password protection, digital signatures and certification
+---------------------------------------------------------
+
+Password protected PDFs usually have two passwords, and owner and user password. When the user password is set to empty, PDF readers will open the file automatically and marked it as "(SECURED)". While not as reliable as a digital signature, this indicates that whoever set the password approved of the file at that time. When the user password is set, the document cannot be viewed without the password.
+
+Either way, OCRmyPDF does not remove passwords from PDFs and exits with an error on encountering them.
+
+``qpdf``, one of OCRmyPDF's dependencies, can remove passwords. If the owner and user password are set, a password is required for ``qpdf``. If only the owner password is set, then the password can be stripped, even if one does not have the owner password.
+
+After OCR is applied, password protection is not permitted on PDF/A documents but the file can be converted to regular PDF.
+
+Many programs exist which are capable of inserting an image of someone's signature. On its own, this offers no security guarantees. It is trivial to remove the signature image and apply it to other files. This practice offers no real security.
+
+Important documents can be digitally signed and certified to attest to their authorship. OCRmyPDF cannot do this. Open source tools such as pdfbox (Java) have this capability as does Adobe Acrobat.

ocrmypdf/__init__.py

@@ -1,12 +0,0 @@
-from enum import IntEnum
-
-
-class ExitCode(IntEnum):
-    ok = 0
-    bad_args = 1
-    input_file = 2
-    missing_dependency = 3
-    invalid_output_pdfa = 4
-    file_access_error = 5
-    already_done_ocr = 6
-    other_error = 15

ocrmypdf/ghostscript.py

@@ -1,54 +0,0 @@
-#!/usr/bin/env python3
-# © 2015 James R. Barlow: github.com/jbarlow83
-
-from tempfile import NamedTemporaryFile
-from subprocess import Popen, PIPE, check_call
-from shutil import copy
-
-
-def rasterize_pdf(input_file, output_file, xres, yres, raster_device, log):
-    with NamedTemporaryFile(delete=True) as tmp:
-        args_gs = [
-            'gs',
-            '-dQUIET',
-            '-dBATCH',
-            '-dNOPAUSE',
-            '-sDEVICE=%s' % raster_device,
-            '-o', tmp.name,
-            '-r{0}x{1}'.format(str(xres), str(yres)),
-            input_file
-        ]
-
-        p = Popen(args_gs, close_fds=True, stdout=PIPE, stderr=PIPE,
-                  universal_newlines=True)
-        stdout, stderr = p.communicate()
-        if stdout:
-            log.debug(stdout)
-        if stderr:
-            log.error(stderr)
-
-        if p.returncode == 0:
-            copy(tmp.name, output_file)
-        else:
-            log.error('Ghostscript rendering failed')
-
-
-def generate_pdfa(pdf_pages, output_file, threads=1):
-    with NamedTemporaryFile(delete=True) as gs_pdf:
-        args_gs = [
-            "gs",
-            "-dQUIET",
-            "-dBATCH",
-            "-dNOPAUSE",
-            '-dNumRenderingThreads=' + str(threads),
-            "-sDEVICE=pdfwrite",
-            "-sColorConversionStrategy=/RGB",
-            "-sProcessColorModel=DeviceRGB",
-            "-dPDFA=2",
-            "-sPDFACompatibilityPolicy=2",
-            "-sOutputICCProfile=srgb.icc",
-            "-sOutputFile=" + gs_pdf.name,
-        ]
-        args_gs.extend(pdf_pages)
-        check_call(args_gs)
-        copy(gs_pdf.name, output_file)

ocrmypdf/hocrtransform.py

@@ -1,230 +0,0 @@
-#!/usr/local/bin/python3
-##############################################################################
-# Copyright (c) 2013-14: fritz-hh from Github
-#   (https://github.com/fritz-hh)
-#
-# Copyright (c) 2010: Jonathan Brinley from Github
-#   (https://github.com/jbrinley/HocrConverter)
-#   Initial version by Jonathan Brinley, jonathanbrinley@gmail.com
-##############################################################################
-from reportlab.pdfgen.canvas import Canvas
-from reportlab.lib.units import inch
-from xml.etree import ElementTree
-from PIL import Image
-from collections import namedtuple
-import re
-import argparse
-
-
-Rect = namedtuple('Rect', ['x1', 'y1', 'x2', 'y2'])
-
-
-class HocrTransformError(Exception):
-    pass
-
-
-class HocrTransform():
-
-    """
-    A class for converting documents from the hOCR format.
-    For details of the hOCR format, see:
-    http://docs.google.com/View?docid=dfxcv4vc_67g844kf
-    """
-
-    def __init__(self, hocrFileName, dpi):
-        self.dpi = dpi
-        self.boxPattern = re.compile(r'bbox((\s+\d+){4})')
-
-        self.hocr = ElementTree.parse(hocrFileName)
-
-        # if the hOCR file has a namespace, ElementTree requires its use to
-        # find elements
-        matches = re.match(r'({.*})html', self.hocr.getroot().tag)
-        self.xmlns = ''
-        if matches:
-            self.xmlns = matches.group(1)
-
-        # get dimension in pt (not pixel!!!!) of the OCRed image
-        self.width, self.height = None, None
-        for div in self.hocr.findall(
-                ".//%sdiv[@class='ocr_page']" % (self.xmlns)):
-            coords = self.element_coordinates(div)
-            pt_coords = self.pt_from_pixel(coords)
-            self.width = pt_coords.x2 - pt_coords.x1
-            self.height = pt_coords.y2 - pt_coords.y1
-            # there shouldn't be more than one, and if there is, we don't want
-            # it
-            break
-        if self.width is None or self.height is None:
-            raise HocrTransformError("hocr file is missing page dimensions")
-
-    def __str__(self):
-        """
-        Return the textual content of the HTML body
-        """
-        if self.hocr is None:
-            return ''
-        body = self.hocr.find(".//%sbody" % (self.xmlns))
-        if body:
-            return self._get_element_text(body)
-        else:
-            return ''
-
-    def _get_element_text(self, element):
-        """
-        Return the textual content of the element and its children
-        """
-        text = ''
-        if element.text is not None:
-            text += element.text
-        for child in element.getchildren():
-            text += self._get_element_text(child)
-        if element.tail is not None:
-            text += element.tail
-        return text
-
-    def element_coordinates(self, element):
-        """
-        Returns a tuple containing the coordinates of the bounding box around
-        an element
-        """
-        out = (0, 0, 0, 0)
-        if 'title' in element.attrib:
-            matches = self.boxPattern.search(element.attrib['title'])
-            if matches:
-                coords = matches.group(1).split()
-                out = Rect._make(int(coords[n]) for n in range(4))
-        return out
-
-    def pt_from_pixel(self, pxl):
-        """
-        Returns the quantity in PDF units (pt) given quantity in pixels
-        """
-        return Rect._make(
-            (c / self.dpi * inch) for c in pxl)
-
-    def replace_unsupported_chars(self, s):
-        """
-        Given an input string, returns the corresponding string that:
-        - is available in the helvetica facetype
-        - does not contain any ligature (to allow easy search in the PDF file)
-        """
-        # The 'u' before the character to replace indicates that it is a
-        # unicode character
-        s = s.replace(u"fl", "fl")
-        s = s.replace(u"fi", "fi")
-        return s
-
-    def to_pdf(self, outFileName, imageFileName=None, showBoundingboxes=False,
-               fontname="Helvetica", invisibleText=False):
-        """
-        Creates a PDF file with an image superimposed on top of the text.
-        Text is positioned according to the bounding box of the lines in
-        the hOCR file.
-        The image need not be identical to the image used to create the hOCR
-        file.
-        It can have a lower resolution, different color mode, etc.
-        """
-        # create the PDF file
-        # page size in points (1/72 in.)
-        pdf = Canvas(
-            outFileName, pagesize=(self.width, self.height), pageCompression=1)
-
-        # draw bounding box for each paragraph
-        # light blue for bounding box of paragraph
-        pdf.setStrokeColorRGB(0, 1, 1)
-        # light blue for bounding box of paragraph
-        pdf.setFillColorRGB(0, 1, 1)
-        pdf.setLineWidth(0)		# no line for bounding box
-        for elem in self.hocr.findall(
-                ".//%sp[@class='%s']" % (self.xmlns, "ocr_par")):
-
-            elemtxt = self._get_element_text(elem).rstrip()
-            if len(elemtxt) == 0:
-                continue
-
-            pxl_coords = self.element_coordinates(elem)
-            pt = self.pt_from_pixel(pxl_coords)
-
-            # draw the bbox border
-            if showBoundingboxes:
-                pdf.rect(
-                    pt.x1, self.height - pt.y2, pt.x2 - pt.x1, pt.y2 - pt.y1,
-                    fill=1)
-
-        # check if element with class 'ocrx_word' are available
-        # otherwise use 'ocr_line' as fallback
-        elemclass = "ocr_line"
-        if self.hocr.find(
-                ".//%sspan[@class='ocrx_word']" % (self.xmlns)) is not None:
-            elemclass = "ocrx_word"
-
-        # itterate all text elements
-        # light green for bounding box of word/line
-        pdf.setStrokeColorRGB(1, 0, 0)
-        pdf.setLineWidth(0.5)		# bounding box line width
-        pdf.setDash(6, 3)		# bounding box is dashed
-        pdf.setFillColorRGB(0, 0, 0)  # text in black
-        for elem in self.hocr.findall(
-                ".//%sspan[@class='%s']" % (self.xmlns, elemclass)):
-
-            elemtxt = self._get_element_text(elem).rstrip()
-
-            elemtxt = self.replace_unsupported_chars(elemtxt)
-
-            if len(elemtxt) == 0:
-                continue
-
-            pxl_coords = self.element_coordinates(elem)
-            pt = self.pt_from_pixel(pxl_coords)
-
-            # draw the bbox border
-            if showBoundingboxes:
-                pdf.rect(
-                    pt.x1, self.height - pt.y2, pt.x2 - pt.x1, pt.y2 - pt.y1,
-                    fill=0)
-
-            text = pdf.beginText()
-            fontsize = pt.y2 - pt.y1
-            text.setFont(fontname, fontsize)
-            if invisibleText:
-                text.setTextRenderMode(3)  # Invisible (indicates OCR text)
-
-            # set cursor to bottom left corner of bbox (adjust for dpi)
-            text.setTextOrigin(pt.x1, self.height - pt.y2)
-
-            # scale the width of the text to fill the width of the bbox
-            text.setHorizScale(
-                100 * (pt.x2 - pt.x1) / pdf.stringWidth(
-                    elemtxt, fontname, fontsize))
-
-            # write the text to the page
-            text.textLine(elemtxt)
-            pdf.drawText(text)
-
-        # put the image on the page, scaled to fill the page
-        if imageFileName is not None:
-            pdf.drawImage(imageFileName, 0, 0,
-                          width=self.width, height=self.height)
-
-        # finish up the page and save it
-        pdf.showPage()
-        pdf.save()
-
-
-if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description='Convert hocr file to PDF')
-    parser.add_argument('-b', '--boundingboxes', action="store_true",
-                        default=False, help='Show bounding boxes borders')
-    parser.add_argument('-r', '--resolution', type=int,
-                        default=300,
-                        help='Resolution of the image that was OCRed')
-    parser.add_argument('-i', '--image', default=None,
-                        help='Path to the image to be placed above the text')
-    parser.add_argument('hocrfile', help='Path to the hocr file to be parsed')
-    parser.add_argument(
-        'outputfile', help='Path to the PDF file to be generated')
-    args = parser.parse_args()
-
-    hocr = HocrTransform(args.hocrfile, args.resolution)
-    hocr.to_pdf(args.outputfile, args.image, args.boundingboxes)

ocrmypdf/leptonica.py

@@ -1,331 +0,0 @@
-#!/usr/bin/env python2
-# -*- coding: utf-8 -*-
-#
-# © 2013-15: jbarlow83 from Github (https://github.com/jbarlow83)
-#
-#
-# Use Leptonica to detect find and remove page skew.  Leptonica uses the method
-# of differential square sums, which its author claim is faster and more robust
-# than the Hough transform used by ImageMagick.
-
-from __future__ import print_function, absolute_import, division
-import argparse
-import ctypes as C
-import sys
-import os
-import logging
-from tempfile import TemporaryFile
-
-logger = logging.getLogger(__name__)
-
-
-def stderr(*objs):
-    """Python 2/3 compatible print to stderr.
-    """
-    print("leptonica.py:", *objs, file=sys.stderr)
-
-
-from ctypes.util import find_library
-lept_lib = find_library('lept')
-if not lept_lib:
-    stderr("Could not find the Leptonica library")
-    sys.exit(3)
-try:
-    lept = C.cdll.LoadLibrary(lept_lib)
-except Exception:
-    stderr("Could not load the Leptonica library from %s", lept_lib)
-    sys.exit(3)
-
-
-class _PIXCOLORMAP(C.Structure):
-    """struct PixColormap from Leptonica src/pix.h
-    """
-
-    _fields_ = [
-        ("array", C.c_void_p),
-        ("depth", C.c_int32),
-        ("nalloc", C.c_int32),
-        ("n", C.c_int32)
-    ]
-
-
-class _PIX(C.Structure):
-    """struct Pix from Leptonica src/pix.h
-    """
-
-    _fields_ = [
-        ("w", C.c_uint32),
-        ("h", C.c_uint32),
-        ("d", C.c_uint32),
-        ("wpl", C.c_uint32),
-        ("refcount", C.c_uint32),
-        ("xres", C.c_int32),
-        ("yres", C.c_int32),
-        ("informat", C.c_int32),
-        ("text", C.POINTER(C.c_char)),
-        ("colormap", C.POINTER(_PIXCOLORMAP)),
-        ("data", C.POINTER(C.c_uint32))
-    ]
-
-
-PIX = C.POINTER(_PIX)
-
-lept.pixRead.argtypes = [C.c_char_p]
-lept.pixRead.restype = PIX
-lept.pixScale.argtypes = [PIX, C.c_float, C.c_float]
-lept.pixScale.restype = PIX
-lept.pixDeskew.argtypes = [PIX, C.c_int32]
-lept.pixDeskew.restype = PIX
-lept.pixFindSkew.argtypes = [PIX, C.POINTER(C.c_float), C.POINTER(C.c_float)]
-lept.pixFindSkew.restype = C.c_int32
-lept.pixWriteImpliedFormat.argtypes = [C.c_char_p, PIX, C.c_int32, C.c_int32]
-lept.pixWriteImpliedFormat.restype = C.c_int32
-lept.pixDestroy.argtypes = [C.POINTER(PIX)]
-lept.pixDestroy.restype = None
-lept.getLeptonicaVersion.argtypes = []
-lept.getLeptonicaVersion.restype = C.c_char_p
-
-
-class LeptonicaErrorTrap(object):
-    """Context manager to trap errors reported by Leptonica.
-
-    Leptonica's error return codes are unreliable to the point of being
-    almost useless.  It does, however, write errors to stderr provided that is
-    not disabled at its compile time.  Fortunately this is done using error
-    macros so it is very self-consistent.
-
-    This context manager redirects stderr to a temporary file which is then
-    read and parsed for error messages.  As a side benefit, debug messages
-    from Leptonica are also suppressed.
-
-    """
-    def __enter__(self):
-        self.tmpfile = TemporaryFile()
-
-        # Save the old stderr, and redirect stderr to temporary file
-        self.old_stderr_fileno = os.dup(sys.stderr.fileno())
-        os.dup2(self.tmpfile.fileno(), sys.stderr.fileno())
-        return
-
-    def __exit__(self, exc_type, exc_value, traceback):
-        # Restore old stderr
-        os.dup2(self.old_stderr_fileno, sys.stderr.fileno())
-
-        # Get data from tmpfile (in with block to ensure it is closed)
-        with self.tmpfile as tmpfile:
-            tmpfile.seek(0)  # Cursor will be at end, so move back to beginning
-            leptonica_output = tmpfile.read().decode(errors='replace')
-
-        # If there are Python errors, let them bubble up
-        if exc_type:
-            logger.warning(leptonica_output)
-            return False
-
-        # If there are Leptonica errors, wrap them in Python excpetions
-        if 'Error' in leptonica_output:
-            if 'image file not found' in leptonica_output:
-                raise FileNotFoundError()
-            if 'pixWrite: stream not opened' in leptonica_output:
-                raise LeptonicaIOError()
-            raise LeptonicaError(leptonica_output)
-
-        return False
-
-
-class LeptonicaError(Exception):
-    pass
-
-
-class LeptonicaIOError(LeptonicaError):
-    pass
-
-
-def pixRead(filename):
-    """Load an image file into a PIX object.
-
-    Leptonica can load TIFF, PNM (PBM, PGM, PPM), PNG, and JPEG.  If loading
-    fails then the object will wrap a C null pointer.
-
-    """
-    with LeptonicaErrorTrap():
-        return lept.pixRead(filename.encode(sys.getfilesystemencoding()))
-
-
-def pixScale(pix, scalex, scaley):
-    """Returns the pix object rescaled according to the proportions given."""
-    with LeptonicaErrorTrap():
-        return lept.pixScale(pix, scalex, scaley)
-
-
-def pixDeskew(pix, reduction_factor=0):
-    """Returns the deskewed pix object.
-
-    A clone of the original is returned when the algorithm cannot find a skew
-    angle with sufficient confidence.
-
-    reduction_factor -- amount to downsample (0 for default) when searching
-        for skew angle
-
-    """
-    with LeptonicaErrorTrap():
-        return lept.pixDeskew(pix, reduction_factor)
-
-
-def pixFindSkew(pix):
-    """Returns a tuple (deskew angle in degrees, confidence value).
-
-    Returns (None, None) if no angle is available.
-
-    """
-    with LeptonicaErrorTrap():
-        angle = C.c_float(0.0)
-        confidence = C.c_float(0.0)
-        result = lept.pixFindSkew(pix, C.byref(angle), C.byref(confidence))
-        if result == 0:
-            return (angle.value, confidence.value)
-        else:
-            return (None, None)
-
-
-def pixWriteImpliedFormat(filename, pix, jpeg_quality=0, jpeg_progressive=0):
-    """Write pix to the filename, with the extension indicating format.
-
-    jpeg_quality -- quality (iff JPEG; 1 - 100, 0 for default)
-    jpeg_progressive -- (iff JPEG; 0 for baseline seq., 1 for progressive)
-
-    """
-    fileroot, extension = os.path.splitext(filename)
-    fix_pnm = False
-    if extension.lower() in ('.pbm', '.pgm', '.ppm'):
-        # Leptonica does not process handle these extensions correctly, but
-        # does handle .pnm correctly.  Add another .pnm suffix.
-        filename += '.pnm'
-        fix_pnm = True
-
-    with LeptonicaErrorTrap():
-        lept.pixWriteImpliedFormat(
-            filename.encode(sys.getfilesystemencoding()),
-            pix, jpeg_quality, jpeg_progressive)
-
-    if fix_pnm:
-        from shutil import move
-        move(filename, filename[:-4])   # Remove .pnm suffix
-
-
-def pixDestroy(pix):
-    """Destroy the pix object.
-
-    Function signature is pixDestroy(struct Pix **), hence C.byref() to pass
-    the address of the pointer.
-
-    """
-    with LeptonicaErrorTrap():
-        lept.pixDestroy(C.byref(pix))
-
-
-def getLeptonicaVersion():
-    """Get Leptonica version string.
-
-    Caveat: Leptonica expects the caller to free this memory.  We don't,
-    since that would involve binding to libc to access libc.free(),
-    a pointless effort to reclaim 100 bytes of memory.
-
-    """
-    return lept.getLeptonicaVersion().decode()
-
-
-def deskew(infile, outfile, dpi):
-    try:
-        pix_source = pixRead(infile)
-    except LeptonicaIOError:
-        raise LeptonicaIOError("Failed to open file: %s" % infile)
-
-    if dpi < 150:
-        reduction_factor = 1  # Don't downsample too much if DPI is already low
-    else:
-        reduction_factor = 0  # Use default
-    pix_deskewed = pixDeskew(pix_source, reduction_factor)
-
-    try:
-        pixWriteImpliedFormat(outfile, pix_deskewed)
-    except LeptonicaIOError:
-        raise LeptonicaIOError("Failed to open destination file: %s" % outfile)
-    pixDestroy(pix_source)
-    pixDestroy(pix_deskewed)
-
-
-if __name__ == '__main__':
-    parser = argparse.ArgumentParser(
-        description="Python wrapper to access Leptonica")
-
-    subparsers = parser.add_subparsers(title='commands',
-                                       description='supported operations')
-
-    parser_deskew = subparsers.add_parser('deskew')
-    parser_deskew.add_argument('-r', '--dpi', dest='dpi', action='store',
-                               type=int, default=300, help='input resolution')
-    parser_deskew.add_argument('infile', help='image to deskew')
-    parser_deskew.add_argument('outfile', help='deskewed output image')
-    parser_deskew.set_defaults(func=deskew)
-
-    args = parser.parse_args()
-
-    if getLeptonicaVersion() != u'leptonica-1.69':
-        print("Unexpected leptonica version: %s" % getLeptonicaVersion())
-
-    args.func(args)
-
-
-def _test_output(mode, extension, im_format):
-    from PIL import Image
-    from tempfile import NamedTemporaryFile
-
-    with NamedTemporaryFile(prefix='test-lept-pnm', suffix=extension, delete=True) as tmpfile:
-        im = Image.new(mode=mode, size=(100, 100))
-        im.save(tmpfile)
-
-        pix = pixRead(tmpfile.name)
-        pixWriteImpliedFormat(tmpfile.name, pix)
-        pixDestroy(pix)
-
-        im_roundtrip = Image.open(tmpfile.name)
-        assert im_roundtrip.mode == im.mode, "leptonica mode differs"
-        assert im_roundtrip.format == im_format, \
-            "{0}: leptonica produced a {1}".format(
-                extension,
-                im_roundtrip.format)
-
-
-def test_pnm_output():
-    params = [['1', '.pbm', 'PPM'], ['L', '.pgm', 'PPM'],
-              ['RGB', '.ppm', 'PPM']]
-    for param in params:
-        _test_output(*param)
-
-
-def test_skew_angle():
-    from PIL import Image, ImageDraw
-    from tempfile import NamedTemporaryFile
-
-    im = Image.new(mode='1', size=(1000, 1000), color=1)
-
-    draw = ImageDraw.Draw(im)
-    for n in range(20):
-        draw.line([(50, 25 + 50*n), (950, 25 + 50*n)], width=1)
-    del draw
-
-    test_angles = [0.1 * ang for ang in range(1, 10)] + \
-                  [float(ang) for ang in range(1, 7)]
-    test_angles += [-ang for ang in test_angles]
-    test_angles = sorted(test_angles)
-
-    for rotate_angle in test_angles:
-        rotated_im = im.rotate(rotate_angle)
-        with NamedTemporaryFile(prefix='lept-skew', suffix='.png', delete=True) as tmpfile:
-            rotated_im.save(tmpfile)
-            pix = pixRead(tmpfile.name)
-            angle, confidence = pixFindSkew(pix)
-            pixDestroy(pix)
-            print('{0} {1}  {2}'.format(rotate_angle, angle, confidence), file=sys.stderr)
-
-

ocrmypdf/main.py

@@ -1,933 +0,0 @@
-#!/usr/bin/env python3
-# © 2015 James R. Barlow: github.com/jbarlow83
-
-from contextlib import suppress
-from tempfile import NamedTemporaryFile, mkdtemp
-import sys
-import os
-import re
-import shutil
-import warnings
-import multiprocessing
-import atexit
-import textwrap
-
-import PyPDF2 as pypdf
-from PIL import Image
-
-from subprocess import Popen, check_call, PIPE, CalledProcessError, \
-    TimeoutExpired, check_output, STDOUT
-try:
-    from subprocess import DEVNULL
-except ImportError:
-    DEVNULL = open(os.devnull, 'wb')
-
-
-from ruffus import transform, suffix, merge, active_if, regex, jobs_limit, \
-    formatter, follows, split, collate, check_if_uptodate
-import ruffus.ruffus_exceptions as ruffus_exceptions
-import ruffus.cmdline as cmdline
-
-from .hocrtransform import HocrTransform
-from .pageinfo import pdf_get_all_pageinfo
-from .pdfa import generate_pdfa_def
-from . import ghostscript
-from . import tesseract
-from . import ExitCode
-
-warnings.simplefilter('ignore', pypdf.utils.PdfReadWarning)
-
-
-BASEDIR = os.path.dirname(os.path.realpath(__file__))
-VERSION = '3.1'
-
-
-# -------------
-# External dependencies
-
-MINIMUM_TESS_VERSION = '3.02.02'
-
-
-def complain(message):
-    print(*textwrap.wrap(message), file=sys.stderr)
-
-
-if tesseract.version() < MINIMUM_TESS_VERSION:
-    complain(
-        "Please install tesseract {0} or newer "
-        "(currently installed version is {1})".format(
-            MINIMUM_TESS_VERSION, tesseract.version()))
-    sys.exit(ExitCode.missing_dependency)
-
-
-try:
-    import PIL.features
-    check_codec = PIL.features.check_codec
-except (ImportError, AttributeError):
-    def check_codec(codec_name):
-        if codec_name == 'jpg':
-            return 'jpeg_encoder' in dir(Image.core)
-        elif codec_name == 'zlib':
-            return 'zip_encoder' in dir(Image.core)
-        raise NotImplementedError(codec_name)
-
-
-def check_pil_encoder(codec_name, friendly_name):
-    try:
-        if check_codec(codec_name):
-            return
-    except Exception:
-        pass
-    complain(
-        "ERROR: Your version of the Python imaging library (Pillow) was "
-        "compiled without support for " + friendly_name + " encoding/decoding."
-        "\n"
-        "You will need to uninstall Pillow and reinstall it with PNG and JPEG "
-        "support (libjpeg and zlib)."
-        "\n"
-        "See installation instructions for your platform here:\n"
-        "    https://pillow.readthedocs.org/installation.html"
-    )
-    sys.exit(ExitCode.missing_dependency)
-
-
-check_pil_encoder('jpg', 'JPEG')
-check_pil_encoder('zlib', 'PNG')
-
-
-# -------------
-# Parser
-
-parser = cmdline.get_argparse(
-    prog="ocrmypdf",
-    description="Generate searchable PDF file from an image-only PDF file.",
-    version=VERSION,
-    fromfile_prefix_chars='@',
-    ignored_args=[
-        'touch_files_only', 'recreate_database', 'checksum_file_name',
-        'key_legend_in_graph', 'draw_graph_horizontally', 'flowchart_format',
-        'forced_tasks', 'target_tasks', 'use_threads'])
-
-parser.add_argument(
-    'input_file',
-    help="PDF file containing the images to be OCRed")
-parser.add_argument(
-    'output_file',
-    help="output searchable PDF file")
-parser.add_argument(
-    '-l', '--language', action='append',
-    help="languages of the file to be OCRed")
-
-metadata = parser.add_argument_group(
-    "Metadata options",
-    "Set output PDF/A metadata (default: use input document's title)")
-metadata.add_argument(
-    '--title', type=str,
-    help="set document title (place multiple words in quotes)")
-metadata.add_argument(
-    '--author', type=str,
-    help="set document author")
-metadata.add_argument(
-    '--subject', type=str,
-    help="set document")
-metadata.add_argument(
-    '--keywords', type=str,
-    help="set document keywords")
-
-
-preprocessing = parser.add_argument_group(
-    "Preprocessing options",
-    "Improve OCR quality and final image")
-preprocessing.add_argument(
-    '-d', '--deskew', action='store_true',
-    help="deskew each page before performing OCR")
-preprocessing.add_argument(
-    '-c', '--clean', action='store_true',
-    help="clean pages from scanning artifacts before performing OCR")
-preprocessing.add_argument(
-    '-i', '--clean-final', action='store_true',
-    help="incorporate the cleaned image in the final PDF file")
-preprocessing.add_argument(
-    '--oversample', metavar='DPI', type=int, default=0,
-    help="oversample images to at least the specified DPI, to improve OCR "
-         "results slightly")
-
-parser.add_argument(
-    '-f', '--force-ocr', action='store_true',
-    help="rasterize any fonts or vector images on each page and apply OCR")
-parser.add_argument(
-    '-s', '--skip-text', action='store_true',
-    help="skip OCR on any pages that already contain text, but include the"
-         " page in final output")
-parser.add_argument(
-    '--skip-big', type=float, metavar='MPixels',
-    help="skip OCR on pages larger than the specified amount of megapixels, "
-         "but include skipped pages in final output")
-# parser.add_argument(
-#     '--exact-image', action='store_true',
-#     help="Use original page from PDF without re-rendering")
-
-advanced = parser.add_argument_group(
-    "Advanced",
-    "Advanced options for power users")
-advanced.add_argument(
-    '--tesseract-config', default=[], type=list, action='append',
-    help="additional Tesseract configuration files")
-advanced.add_argument(
-    '--pdf-renderer', choices=['auto', 'tesseract', 'hocr'], default='auto',
-    help='choose OCR PDF renderer')
-advanced.add_argument(
-    '--tesseract-timeout', default=180.0, type=float,
-    help='give up on OCR after the timeout, but copy the preprocessed page '
-         'into the final output')
-
-debugging = parser.add_argument_group(
-    "Debugging",
-    "Arguments to help with troubleshooting and debugging")
-debugging.add_argument(
-    '-k', '--keep-temporary-files', action='store_true',
-    help="keep temporary files (helpful for debugging)")
-debugging.add_argument(
-    '-g', '--debug-rendering', action='store_true',
-    help="render each page twice with debug information on second page")
-
-options = parser.parse_args()
-
-
-# ----------
-# Languages
-
-if not options.language:
-    options.language = ['eng']  # Enforce English hegemony
-
-# Support v2.x "eng+deu" language syntax
-if '+' in options.language[0]:
-    options.language = options.language[0].split('+')
-
-if not set(options.language).issubset(tesseract.languages()):
-    complain(
-        "The installed version of tesseract does not have language "
-        "data for the following requested languages: ")
-    for lang in (set(options.language) - tesseract.languages()):
-        complain(lang)
-    sys.exit(ExitCode.bad_args)
-
-
-# ----------
-# Arguments
-
-if options.pdf_renderer == 'auto':
-    options.pdf_renderer = 'hocr'
-
-if any((options.deskew, options.clean, options.clean_final)):
-    try:
-        from . import unpaper
-    except ImportError:
-        complain(
-            "Install the 'unpaper' program to use --deskew or --clean.")
-        sys.exit(ExitCode.bad_args)
-else:
-    unpaper = None
-
-if options.debug_rendering and options.pdf_renderer == 'tesseract':
-    complain(
-        "Ignoring --debug-rendering because it is not supported with"
-        "--pdf-renderer=tesseract.")
-
-if options.force_ocr and options.skip_text:
-    complain(
-        "Error: --force-ocr and --skip-text are mutually incompatible.")
-    sys.exit(ExitCode.bad_args)
-
-if options.clean and not options.clean_final \
-        and options.pdf_renderer == 'tesseract':
-    complain(
-        "Tesseract PDF renderer cannot render --clean pages without "
-        "also performing --clean-final, so --clean-final is assumed.")
-
-
-# ----------
-# Logging
-
-
-_logger, _logger_mutex = cmdline.setup_logging(__name__, options.log_file,
-                                               options.verbose)
-
-
-class WrappedLogger:
-
-    def __init__(self, my_logger, my_mutex):
-        self.logger = my_logger
-        self.mutex = my_mutex
-
-    def log(self, *args, **kwargs):
-        with self.mutex:
-            self.logger.log(*args, **kwargs)
-
-    def debug(self, *args, **kwargs):
-        with self.mutex:
-            self.logger.debug(*args, **kwargs)
-
-    def info(self, *args, **kwargs):
-        with self.mutex:
-            self.logger.info(*args, **kwargs)
-
-    def warning(self, *args, **kwargs):
-        with self.mutex:
-            self.logger.warning(*args, **kwargs)
-
-    def error(self, *args, **kwargs):
-        with self.mutex:
-            self.logger.error(*args, **kwargs)
-
-    def critical(self, *args, **kwargs):
-        with self.mutex:
-            self.logger.critical(*args, **kwargs)
-
-_log = WrappedLogger(_logger, _logger_mutex)
-
-
-def re_symlink(input_file, soft_link_name, log=_log):
-    """
-    Helper function: relinks soft symbolic link if necessary
-    """
-    # Guard against soft linking to oneself
-    if input_file == soft_link_name:
-        log.debug("Warning: No symbolic link made. You are using " +
-                  "the original data directory as the working directory.")
-        return
-
-    # Soft link already exists: delete for relink?
-    if os.path.lexists(soft_link_name):
-        # do not delete or overwrite real (non-soft link) file
-        if not os.path.islink(soft_link_name):
-            raise Exception("%s exists and is not a link" % soft_link_name)
-        try:
-            os.unlink(soft_link_name)
-        except:
-            log.debug("Can't unlink %s" % (soft_link_name))
-
-    if not os.path.exists(input_file):
-        raise Exception("trying to create a broken symlink to %s" % input_file)
-
-    log.debug("os.symlink(%s, %s)" % (input_file, soft_link_name))
-
-    # Create symbolic link using absolute path
-    os.symlink(
-        os.path.abspath(input_file),
-        soft_link_name
-    )
-
-
-# -------------
-# The Pipeline
-
-manager = multiprocessing.Manager()
-_pdfinfo = manager.list()
-_pdfinfo_lock = manager.Lock()
-
-work_folder = mkdtemp(prefix="com.github.ocrmypdf.")
-
-
-@atexit.register
-def cleanup_working_files(*args):
-    if options.keep_temporary_files:
-        print("Temporary working files saved at:")
-        print(work_folder)
-    else:
-        with suppress(FileNotFoundError):
-            shutil.rmtree(work_folder)
-
-
-@transform(
-    input=options.input_file,
-    filter=formatter('(?i)\.pdf'),
-    output=work_folder + '{basename[0]}.repaired.pdf',
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def repair_pdf(
-        input_file,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-    args_qpdf = [
-        'qpdf', input_file, output_file
-    ]
-    try:
-        out = check_output(args_qpdf, stderr=STDOUT, universal_newlines=True)
-    except CalledProcessError as e:
-        if e.returncode == 2:
-            print("{0}: not a valid PDF, and could not repair it.".format(
-                    options.input_file))
-            print("Details:")
-            print(e.output)
-        else:
-            print(e.output)
-        sys.exit(ExitCode.input_file)
-
-    log.debug(out)
-
-    with pdfinfo_lock:
-        pdfinfo.extend(pdf_get_all_pageinfo(output_file))
-        log.info(pdfinfo)
-
-
-def get_pageinfo(input_file, pdfinfo, pdfinfo_lock):
-    pageno = int(os.path.basename(input_file)[0:6]) - 1
-    with pdfinfo_lock:
-        pageinfo = pdfinfo[pageno].copy()
-    return pageinfo
-
-
-def is_ocr_required(pageinfo, log):
-    page = pageinfo['pageno'] + 1
-    ocr_required = True
-    if not pageinfo['images']:
-        # If the page has no images, then it contains vector content or text
-        # or both. It seems quite unlikely that one would find meaningful text
-        # from rasterizing vector content. So skip the page.
-        log.info(
-            "Page {0} has no images - skipping OCR".format(page)
-        )
-        ocr_required = False
-    elif pageinfo['has_text']:
-        s = "Page {0} already has text! – {1}"
-
-        if not options.force_ocr and not options.skip_text:
-            log.error(s.format(page,
-                               "aborting (use --force-ocr to force OCR)"))
-            sys.exit(ExitCode.already_done_ocr)
-        elif options.force_ocr:
-            log.info(s.format(page,
-                              "rasterizing text and running OCR anyway"))
-            ocr_required = True
-        elif options.skip_text:
-            log.info(s.format(page,
-                              "skipping all processing on this page"))
-            ocr_required = False
-
-    if ocr_required and options.skip_big:
-        pixel_count = pageinfo['width_pixels'] * pageinfo['height_pixels']
-        if pixel_count > (options.skip_big * 1000000):
-            ocr_required = False
-            log.info(
-                "Page {0} is very large; skipping due to -b".format(page))
-
-    return ocr_required
-
-
-@split(
-    repair_pdf,
-    os.path.join(work_folder, '*.page.pdf'),
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def split_pages(
-        input_file,
-        output_files,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-
-    for oo in output_files:
-        with suppress(FileNotFoundError):
-            os.unlink(oo)
-
-    pages = check_output(['qpdf', '--show-npages', input_file],
-                         universal_newlines=True, close_fds=True)
-
-    for n in range(int(pages)):
-        args_qpdf = [
-            'qpdf', input_file,
-            '--pages', input_file, '{0}'.format(n + 1), '--',
-            os.path.join(work_folder, '{0:06d}.page.pdf'.format(n + 1))
-        ]
-        check_call(args_qpdf)
-
-    from glob import glob
-    for filename in glob(os.path.join(work_folder, '*.page.pdf')):
-        pageinfo = get_pageinfo(filename, pdfinfo, pdfinfo_lock)
-
-        alt_suffix = '.ocr.page.pdf' if is_ocr_required(pageinfo, log) \
-                     else '.skip.page.pdf'
-        re_symlink(
-            filename,
-            os.path.join(
-                work_folder,
-                os.path.basename(filename)[0:6] + alt_suffix))
-
-
-@transform(
-    input=split_pages,
-    filter=suffix('.ocr.page.pdf'),
-    output='.page.png',
-    output_dir=work_folder,
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def rasterize_with_ghostscript(
-        input_file,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-    pageinfo = get_pageinfo(input_file, pdfinfo, pdfinfo_lock)
-
-    device = 'png16m'  # 24-bit
-    if all(image['comp'] == 1 for image in pageinfo['images']):
-        if all(image['bpc'] == 1 for image in pageinfo['images']):
-            device = 'pngmono'
-        elif all(image['bpc'] > 1 and image['color'] == 'index'
-                 for image in pageinfo['images']):
-            device = 'png256'
-        elif all(image['bpc'] > 1 and image['color'] == 'gray'
-                 for image in pageinfo['images']):
-            device = 'pnggray'
-
-    log.debug("Rendering {0} with {1}".format(
-            os.path.basename(input_file), device))
-    xres = max(pageinfo['xres'], options.oversample or 0)
-    yres = max(pageinfo['yres'], options.oversample or 0)
-
-    ghostscript.rasterize_pdf(input_file, output_file, xres, yres, device, log)
-
-
-@transform(
-    input=rasterize_with_ghostscript,
-    filter=suffix(".page.png"),
-    output=".pp-deskew.png",
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def preprocess_deskew(
-        input_file,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-
-    if not options.deskew:
-        re_symlink(input_file, output_file, log)
-        return
-
-    pageinfo = get_pageinfo(input_file, pdfinfo, pdfinfo_lock)
-    dpi = int(pageinfo['xres'])
-
-    unpaper.deskew(input_file, output_file, dpi, log)
-
-
-@transform(
-    input=preprocess_deskew,
-    filter=suffix(".pp-deskew.png"),
-    output=".pp-clean.png",
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def preprocess_clean(
-        input_file,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-
-    if not options.clean:
-        re_symlink(input_file, output_file, log)
-        return
-
-    pageinfo = get_pageinfo(input_file, pdfinfo, pdfinfo_lock)
-    dpi = int(pageinfo['xres'])
-
-    unpaper.clean(input_file, output_file, dpi, log)
-
-
-@active_if(options.pdf_renderer == 'hocr')
-@transform(
-    input=preprocess_clean,
-    filter=suffix(".pp-clean.png"),
-    output=".hocr",
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def ocr_tesseract_hocr(
-        input_file,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-
-    pageinfo = get_pageinfo(input_file, pdfinfo, pdfinfo_lock)
-
-    badxml = os.path.splitext(output_file)[0] + '.badxml'
-
-    args_tesseract = [
-        'tesseract',
-        '-l', '+'.join(options.language),
-        input_file,
-        badxml,
-        'hocr'
-    ] + options.tesseract_config
-    p = Popen(args_tesseract, close_fds=True, stdout=PIPE, stderr=PIPE,
-              universal_newlines=True)
-    try:
-        stdout, stderr = p.communicate(timeout=options.tesseract_timeout)
-    except TimeoutExpired:
-        p.kill()
-        stdout, stderr = p.communicate()
-        # Generate a HOCR file with no recognized text if tesseract times out
-        # Temporary workaround to hocrTransform not being able to function if
-        # it does not have a valid hOCR file.
-        with open(output_file, 'w', encoding="utf-8") as f:
-            f.write(tesseract.HOCR_TEMPLATE.format(
-                pageinfo['width_pixels'],
-                pageinfo['height_pixels']))
-    else:
-        if stdout:
-            log.info(stdout)
-        if stderr:
-            log.error(stderr)
-
-        if p.returncode != 0:
-            raise CalledProcessError(p.returncode, args_tesseract)
-
-        if os.path.exists(badxml + '.html'):
-            # Tesseract 3.02 appends suffix ".html" on its own (.badxml.html)
-            shutil.move(badxml + '.html', badxml)
-        elif os.path.exists(badxml + '.hocr'):
-            # Tesseract 3.03 appends suffix ".hocr" on its own (.badxml.hocr)
-            shutil.move(badxml + '.hocr', badxml)
-
-        # Tesseract 3.03 inserts source filename into hocr file without
-        # escaping it, creating invalid XML and breaking the parser.
-        # As a workaround, rewrite the hocr file, replacing the filename
-        # with a space.  Don't know if Tesseract 3.02 does the same.
-
-        regex_nested_single_quotes = re.compile(
-            r"""title='image "([^"]*)";""")
-        with open(badxml, mode='r', encoding='utf-8') as f_in, \
-                open(output_file, mode='w', encoding='utf-8') as f_out:
-            for line in f_in:
-                line = regex_nested_single_quotes.sub(
-                    r"""title='image " ";""", line)
-                f_out.write(line)
-
-
-@active_if(options.pdf_renderer == 'hocr')
-@collate(
-    input=[rasterize_with_ghostscript, preprocess_deskew, preprocess_clean],
-    filter=regex(r".*/(\d{6})(?:\.page|\.pp-deskew|\.pp-clean)\.png"),
-    output=os.path.join(work_folder, r'\1.image'),
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def select_image_for_pdf(
-        infiles,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-    if options.clean_final:
-        image_suffix = '.pp-clean.png'
-    elif options.deskew:
-        image_suffix = '.pp-deskew.png'
-    else:
-        image_suffix = '.page.png'
-    image = next(ii for ii in infiles if ii.endswith(image_suffix))
-
-    pageinfo = get_pageinfo(image, pdfinfo, pdfinfo_lock)
-    if all(image['enc'] == 'jpeg' for image in pageinfo['images']):
-        # If all images were JPEGs originally, produce a JPEG as output
-        Image.open(image).save(output_file, format='JPEG')
-    else:
-        re_symlink(image, output_file)
-
-
-@active_if(options.pdf_renderer == 'hocr')
-@collate(
-    input=[select_image_for_pdf, ocr_tesseract_hocr],
-    filter=regex(r".*/(\d{6})(?:\.image|\.hocr)"),
-    output=os.path.join(work_folder, r'\1.rendered.pdf'),
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def render_hocr_page(
-        infiles,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-    hocr = next(ii for ii in infiles if ii.endswith('.hocr'))
-    image = next(ii for ii in infiles if ii.endswith('.image'))
-
-    pageinfo = get_pageinfo(image, pdfinfo, pdfinfo_lock)
-    dpi = round(max(pageinfo['xres'], pageinfo['yres'], options.oversample))
-
-    hocrtransform = HocrTransform(hocr, dpi)
-    hocrtransform.to_pdf(output_file, imageFileName=image,
-                         showBoundingboxes=False, invisibleText=True)
-
-
-@active_if(options.pdf_renderer == 'hocr')
-@active_if(options.debug_rendering)
-@collate(
-    input=[select_image_for_pdf, ocr_tesseract_hocr],
-    filter=regex(r".*/(\d{6})(?:\.image|\.hocr)"),
-    output=os.path.join(work_folder, r'\1.debug.pdf'),
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def render_hocr_debug_page(
-        infiles,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-    hocr = next(ii for ii in infiles if ii.endswith('.hocr'))
-    image = next(ii for ii in infiles if ii.endswith('.image'))
-
-    pageinfo = get_pageinfo(image, pdfinfo, pdfinfo_lock)
-    dpi = round(max(pageinfo['xres'], pageinfo['yres'], options.oversample))
-
-    hocrtransform = HocrTransform(hocr, dpi)
-    hocrtransform.to_pdf(output_file, imageFileName=None,
-                         showBoundingboxes=True, invisibleText=False)
-
-
-@active_if(options.pdf_renderer == 'tesseract')
-@collate(
-    input=[preprocess_clean, split_pages],
-    filter=regex(r".*/(\d{6})(?:\.pp-clean\.png|\.page\.pdf)"),
-    output=os.path.join(work_folder, r'\1.rendered.pdf'),
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def tesseract_ocr_and_render_pdf(
-        input_files,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-
-    input_image = next((ii for ii in input_files if ii.endswith('.png')), '')
-    input_pdf = next((ii for ii in input_files if ii.endswith('.pdf')))
-    if not input_image:
-        # Skipping this page
-        re_symlink(input_pdf, output_file)
-        return
-
-    args_tesseract = [
-        'tesseract',
-        '-l', '+'.join(options.language),
-        input_image,
-        os.path.splitext(output_file)[0],  # Tesseract appends suffix
-        'pdf'
-    ] + options.tesseract_config
-    p = Popen(args_tesseract, close_fds=True, stdout=PIPE, stderr=PIPE,
-              universal_newlines=True)
-
-    try:
-        stdout, stderr = p.communicate(timeout=options.tesseract_timeout)
-        if stdout:
-            log.info(stdout)
-        if stderr:
-            log.error(stderr)
-    except TimeoutExpired:
-        p.kill()
-        log.info("Tesseract - page timed out")
-        re_symlink(input_pdf, output_file)
-
-
-@transform(
-    input=repair_pdf,
-    filter=suffix('.repaired.pdf'),
-    output='.pdfa_def.ps',
-    output_dir=work_folder,
-    extras=[_log])
-def generate_postscript_stub(
-        input_file,
-        output_file,
-        log):
-
-    pdf = pypdf.PdfFileReader(input_file)
-
-    def from_document_info(key):
-        # pdf.documentInfo.get() DOES NOT behave as expected for a dict-like
-        # object, so call with precautions.  TypeError may occur if the PDF
-        # is missing the optional document info section.
-        try:
-            s = pdf.documentInfo[key]
-            return str(s)
-        except (KeyError, TypeError):
-            return ''
-
-    pdfmark = {
-        'title': from_document_info('/Title'),
-        'author': from_document_info('/Author'),
-        'keywords': from_document_info('/Keywords'),
-        'subject': from_document_info('/Subject'),
-    }
-    if options.title:
-        pdfmark['title'] = options.title
-    if options.author:
-        pdfmark['author'] = options.author
-    if options.keywords:
-        pdfmark['keywords'] = options.keywords
-    if options.subject:
-        pdfmark['subject'] = options.subject
-
-    pdfmark['creator'] = '{0} {1} / Tesseract OCR{2} {3}'.format(
-            parser.prog, VERSION,
-            '+PDF' if options.pdf_renderer == 'tesseract' else '',
-            tesseract.version())
-
-    generate_pdfa_def(output_file, pdfmark)
-
-
-@transform(
-    input=split_pages,
-    filter=suffix('.skip.page.pdf'),
-    output='.done.pdf',
-    output_dir=work_folder,
-    extras=[_log])
-def skip_page(
-        input_file,
-        output_file,
-        log):
-    re_symlink(input_file, output_file, log)
-
-
-@merge(
-    input=[render_hocr_page, render_hocr_debug_page, skip_page,
-           tesseract_ocr_and_render_pdf, generate_postscript_stub],
-    output=os.path.join(work_folder, 'merged.pdf'),
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def merge_pages(
-        input_files,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-
-    def input_file_order(s):
-        '''Sort order: All rendered pages followed
-        by their debug page, if any, followed by Postscript stub.
-        Ghostscript documentation has the Postscript stub at the
-        beginning, but it works at the end and also gets document info
-        right that way.'''
-        if s.endswith('.ps'):
-            return 99999999
-        key = int(os.path.basename(s)[0:6]) * 10
-        if 'debug' in os.path.basename(s):
-            key += 1
-        return key
-
-    pdf_pages = sorted(input_files, key=input_file_order)
-    log.info(pdf_pages)
-    ghostscript.generate_pdfa(pdf_pages, output_file, options.jobs or 1)
-
-
-@transform(
-    input=merge_pages,
-    filter=formatter(),
-    output=options.output_file,
-    extras=[_log, _pdfinfo, _pdfinfo_lock])
-def copy_final(
-        input_file,
-        output_file,
-        log,
-        pdfinfo,
-        pdfinfo_lock):
-    shutil.copy(input_file, output_file)
-
-
-def validate_pdfa(
-        input_file,
-        log):
-
-    args_qpdf = [
-        'qpdf',
-        '--check',
-        input_file
-    ]
-
-    try:
-        check_output(args_qpdf, stderr=STDOUT, universal_newlines=True)
-    except CalledProcessError as e:
-        if e.returncode == 2:
-            print("{0}: not a valid PDF, and could not repair it.".format(
-                    options.input_file))
-            print("Details:")
-            print(e.output)
-        elif e.returncode == 3:
-            log.info("qpdf --check returned warnings:")
-            log.info(e.output)
-        else:
-            print(e.output)
-        return False
-
-    return True
-
-
-# @active_if(ocr_required and options.exact_image)
-# @merge([render_hocr_blank_page, extract_single_page],
-#        os.path.join(work_folder, "%04i.merged.pdf") % pageno)
-# def merge_hocr_with_original_page(infiles, output_file):
-#     with open(infiles[0], 'rb') as hocr_input, \
-#             open(infiles[1], 'rb') as page_input, \
-#             open(output_file, 'wb') as output:
-#         hocr_reader = pypdf.PdfFileReader(hocr_input)
-#         page_reader = pypdf.PdfFileReader(page_input)
-#         writer = pypdf.PdfFileWriter()
-
-#         the_page = hocr_reader.getPage(0)
-#         the_page.mergePage(page_reader.getPage(0))
-#         writer.addPage(the_page)
-#         writer.write(output)
-
-
-def available_cpu_count():
-    try:
-        return multiprocessing.cpu_count()
-    except NotImplementedError:
-        pass
-
-    try:
-        import psutil
-        return psutil.cpu_count()
-    except (ImportError, AttributeError):
-        pass
-
-    complain(
-        "Could not get CPU count.  Assuming one (1) CPU."
-        "Use -j N to set manually.")
-    return 1
-
-
-def cleanup_ruffus_error_message(msg):
-    msg = re.sub(r'\s+', r' ', msg, re.MULTILINE)
-    msg = re.sub(r"\((.+?)\)", r'\1', msg)
-    msg = msg.strip()
-    return msg
-
-
-def run_pipeline():
-    if not options.jobs or options.jobs == 1:
-        options.jobs = available_cpu_count()
-    try:
-        cmdline.run(options)
-    except ruffus_exceptions.RethrownJobError as e:
-        if options.verbose:
-            print(e)
-
-        # Yuck. Hunt through the ruffus exception to find out what the
-        # return code is supposed to be.
-        for exc in e.args:
-            task_name, job_name, exc_name, exc_value, exc_stack = exc
-            if exc_name == 'builtins.SystemExit':
-                match = re.search(r"\.(.+?)\)", exc_value)
-                exit_code_name = match.groups()[0]
-                exit_code = getattr(ExitCode, exit_code_name, 'other_error')
-                return exit_code
-            elif exc_name == 'ruffus.ruffus_exceptions.MissingInputFileError':
-                print(cleanup_ruffus_error_message(exc_value))
-                return ExitCode.input_file
-            elif exc_name == 'builtins.TypeError':
-                # Even though repair_pdf will fail, ruffus will still try
-                # to call split_pages with no input files, likely due to a bug
-                if task_name == 'split_pages':
-                    print("Input file '{0}' is not a valid PDF".format(
-                        options.input_file))
-                    return ExitCode.input_file
-
-        return ExitCode.other_error
-
-    if not validate_pdfa(options.output_file, _log):
-        _log.warning('Output file: The generated PDF/A file is INVALID')
-        return ExitCode.invalid_output_pdfa
-
-    return ExitCode.ok
-
-
-if __name__ == '__main__':
-    sys.exit(run_pipeline())

ocrmypdf/pageinfo.py

@@ -1,166 +0,0 @@
-#!/usr/bin/env python3
-# © 2015 James R. Barlow: github.com/jbarlow83
-
-from subprocess import Popen, PIPE
-from decimal import Decimal, getcontext
-import re
-import sys
-import PyPDF2 as pypdf
-
-
-FRIENDLY_COLORSPACE = {
-    '/DeviceGray': 'gray',
-    '/CalGray': 'gray',
-    '/DeviceRGB': 'rgb',
-    '/CalRGB': 'rgb',
-    '/DeviceCMYK': 'cmyk',
-    '/Lab': 'lab',
-    '/ICCBased': 'icc',
-    '/Indexed': 'index',
-    '/Separation': 'sep',
-    '/DeviceN': 'devn',
-    '/Pattern': '-'
-}
-
-FRIENDLY_ENCODING = {
-    '/CCITTFaxDecode': 'ccitt',
-    '/DCTDecode': 'jpeg',
-    '/JPXDecode': 'jpx',
-    '/JBIG2Decode': 'jbig2',
-}
-
-FRIENDLY_COMP = {
-    'gray': 1,
-    'rgb': 3,
-    'cmyk': 4,
-    'lab': 3,
-    'index': 1
-}
-
-
-def _page_has_inline_images(page):
-    # PDF always uses \r\n for separator regardless of platform
-    # Really basic heuristic that might trigger the odd false positive
-    # This is only finds the first image and is not quite spec compliant
-    try:
-        contents = page.getContents()
-        data = contents.getData()
-    except AttributeError:
-        # If we can't access the contents or data (empty page?) then there
-        # are no inline images
-        return False
-
-    begin_image, image_data, end_image = False, False, False
-    for data in re.split(b'\s+', data):
-        if data == b'BI':
-            begin_image = True
-        elif data == b'ID':
-            image_data = True
-        elif data == b'EI':
-            end_image = True
-        if all((begin_image, image_data, end_image)):
-            return True
-    return False
-
-
-def _find_page_images(page, pageinfo):
-    try:
-        page['/Resources']['/XObject']
-    except KeyError:
-        return
-
-    # Look for XObject (out of line images)
-    for xobj in page['/Resources']['/XObject']:
-        # PyPDF2 returns the keys as an iterator
-        pdfimage = page['/Resources']['/XObject'][xobj]
-        if pdfimage['/Subtype'] != '/Image':
-            continue
-        if '/ImageMask' in pdfimage:
-            if pdfimage['/ImageMask']:
-                continue
-        image = {}
-        image['width'] = pdfimage['/Width']
-        image['height'] = pdfimage['/Height']
-        image['bpc'] = pdfimage['/BitsPerComponent']
-        if '/Filter' in pdfimage:
-            filter_ = pdfimage['/Filter']
-            if isinstance(filter_, pypdf.generic.ArrayObject):
-                filter_ = filter_[0]
-            image['enc'] = FRIENDLY_ENCODING.get(filter_, 'image')
-        else:
-            image['enc'] = 'image'
-        if '/ColorSpace' in pdfimage:
-            cs = pdfimage['/ColorSpace']
-            if isinstance(cs, pypdf.generic.ArrayObject):
-                cs = cs[0]
-            image['color'] = FRIENDLY_COLORSPACE.get(cs, '-')
-        else:
-            image['color'] = 'jpx' if image['enc'] == 'jpx' else '?'
-
-        image['comp'] = FRIENDLY_COMP.get(image['color'], '?')
-        image['dpi_w'] = image['width'] / pageinfo['width_inches']
-        image['dpi_h'] = image['height'] / pageinfo['height_inches']
-        image['dpi'] = (image['dpi_w'] * image['dpi_h']) ** Decimal(0.5)
-        yield image
-
-
-def _page_has_text(pdf, page):
-    # Simple test
-    text = page.extractText()
-    if text.strip() != '':
-        return True
-
-    # More nuanced test to deal with quirks of Tesseract PDF generation
-    # Check if there's a Glyphless font
-    try:
-        font = page['/Resources']['/Font']
-    except KeyError:
-        pass
-    else:
-        font_objects = list(font.keys())
-        for font_object in font_objects:
-            basefont = font[font_object]['/BaseFont']
-            if basefont.endswith('GlyphLessFont'):
-                return True
-
-    return False
-
-
-def _pdf_get_pageinfo(infile, page: int):
-    pageinfo = {}
-    pageinfo['pageno'] = page
-    pageinfo['images'] = []
-
-    pdf = pypdf.PdfFileReader(infile)
-    page = pdf.pages[page - 1]
-
-    pageinfo['has_text'] = _page_has_text(pdf, page)
-
-    width_pt = page['/MediaBox'][2] - page['/MediaBox'][0]
-    height_pt = page['/MediaBox'][3] - page['/MediaBox'][1]
-    pageinfo['width_inches'] = width_pt / Decimal(72.0)
-    pageinfo['height_inches'] = height_pt / Decimal(72.0)
-
-    pageinfo['images'] = [im for im in _find_page_images(page, pageinfo)]
-
-    # Look for inline images
-    if _page_has_inline_images(page):
-        raise NotImplementedError(
-            "Warning: input PDF contains inline images - not supported")
-
-    if pageinfo['images']:
-        xres = max(image['dpi_w'] for image in pageinfo['images'])
-        yres = max(image['dpi_h'] for image in pageinfo['images'])
-        pageinfo['xres'], pageinfo['yres'] = xres, yres
-        pageinfo['width_pixels'] = \
-            int(round(xres * pageinfo['width_inches']))
-        pageinfo['height_pixels'] = \
-            int(round(yres * pageinfo['height_inches']))
-
-    return pageinfo
-
-
-def pdf_get_all_pageinfo(infile):
-    pdf = pypdf.PdfFileReader(infile)
-    getcontext().prec = 6
-    return [_pdf_get_pageinfo(infile, n) for n in range(pdf.numPages)]

ocrmypdf/pdfa.py

@@ -1,134 +0,0 @@
-#!/usr/bin/env python3
-# © 2015 James R. Barlow: github.com/jbarlow83
-#
-# Generate a PDFA_def.ps file for Ghostscript >= 9.14
-
-from __future__ import print_function, absolute_import, division
-from string import Template
-from subprocess import Popen, PIPE
-import os
-import codecs
-
-
-# This is a template written in PostScript which is needed to create PDF/A
-# files, from the Ghostscript documentation. Lines beginning with % are
-# comments. Python substitution variables have a '$' prefix.
-pdfa_def_template = u"""%!
-% This is a sample prefix file for creating a PDF/A document.
-% Feel free to modify entries marked with "Customize".
-% This assumes an ICC profile to reside in the file (ISO Coated sb.icc),
-% unless the user modifies the corresponding line below.
-
-% Define entries in the document Info dictionary :
-/ICCProfile ($icc_profile)
-def
-
-[ /Title <$title>
-  /Author <$author>
-  /Subject <$subject>
-  /Keywords <$keywords>
-  /Creator <$creator>
-  /DOCINFO pdfmark
-
-% Define an ICC profile :
-
-[/_objdef {icc_PDFA} /type /stream /OBJ pdfmark
-[{icc_PDFA}
-<<
-  /N currentpagedevice /ProcessColorModel known {
-    currentpagedevice /ProcessColorModel get dup /DeviceGray eq
-    {pop 1} {
-      /DeviceRGB eq
-      {3}{4} ifelse
-    } ifelse
-  } {
-    (ERROR, unable to determine ProcessColorModel) == flush
-  } ifelse
->> /PUT pdfmark
-[{icc_PDFA} ICCProfile (r) file /PUT pdfmark
-
-% Define the output intent dictionary :
-
-[/_objdef {OutputIntent_PDFA} /type /dict /OBJ pdfmark
-[{OutputIntent_PDFA} <<
-  /Type /OutputIntent             % Must be so (the standard requires).
-  /S /GTS_PDFA1                   % Must be so (the standard requires).
-  /DestOutputProfile {icc_PDFA}            % Must be so (see above).
-  /OutputConditionIdentifier ($icc_identifier)
->> /PUT pdfmark
-[{Catalog} <</OutputIntents [ {OutputIntent_PDFA} ]>> /PUT pdfmark
-"""
-
-
-def encode_text_string(s: str) -> str:
-    '''Encode text string to hex string for use in a PDF
-
-    From PDF 32000-1:2008 a string object may be included in hexademical form
-    if it is enclosed in angle brackets.  For general Unicode the string should
-    be UTF-16 (big endian) with byte order marks.  A non-hexademical
-    representation is doable but this is preferable since it allows the output
-    Postscript file to be completely ASCII and no escaping of Postscript
-    characters is necessary.
-    '''
-    if s == '':
-        return ''
-    utf16_bytes = s.encode('utf-16be')
-    ascii_hex_bytes = codecs.encode(b'\xfe\xff' + utf16_bytes, 'hex')
-    ascii_hex_str = ascii_hex_bytes.decode('ascii').lower()
-    return ascii_hex_str
-
-
-def _get_pdfa_def(icc_profile, icc_identifier, pdfmark):
-    pdfmark_utf16 = {k: encode_text_string(v) for k, v in pdfmark.items()}
-
-    t = Template(pdfa_def_template)
-    result = t.substitute(icc_profile=icc_profile,
-                          icc_identifier=icc_identifier,
-                          title=pdfmark_utf16.get('title', ''),
-                          author=pdfmark_utf16.get('author', ''),
-                          subject=pdfmark_utf16.get('subject', ''),
-                          creator=pdfmark_utf16.get('creator', ''),
-                          keywords=pdfmark_utf16.get('keywords', ''))
-    return result
-
-
-def _get_postscript_icc_path():
-    "Parse Ghostscript's help message to find where iccprofiles are stored"
-
-    p_gs = Popen(['gs', '--help'], close_fds=True, universal_newlines=True,
-                 stdout=PIPE, stderr=PIPE)
-    out, _ = p_gs.communicate()
-    lines = out.splitlines()
-
-    def search_paths(lines):
-        seeking = True
-        for line in lines:
-            if seeking:
-                if line.startswith('Search path'):
-                    seeking = False
-                    continue
-            else:
-                if line.strip().startswith('/'):
-                    yield from (
-                        path.strip() for path in line.split(':')
-                        if path.strip() != '')
-    for root in search_paths(lines):
-        path = os.path.realpath(os.path.join(root, '../iccprofiles'))
-        if os.path.exists(path):
-            return path
-
-    raise FileNotFoundError("Could not find Ghostscript's iccprofiles")
-
-
-def generate_pdfa_def(target_filename, pdfmark, icc='sRGB'):
-    if icc == 'sRGB':
-        icc_profile = os.path.join(_get_postscript_icc_path(), 'srgb.icc')
-    else:
-        raise NotImplementedError("Only supporting sRGB")
-
-    ps = _get_pdfa_def(icc_profile, icc, pdfmark)
-
-    # Since PostScript might not handle UTF-8 (it's hard to get a clear
-    # answer), insist on ascii
-    with open(target_filename, 'w', encoding='ascii') as f:
-        f.write(ps)

ocrmypdf/tesseract.py

@@ -1,69 +0,0 @@
-#!/usr/bin/env python3
-# © 2015 James R. Barlow: github.com/jbarlow83
-
-from subprocess import STDOUT, CalledProcessError, check_output
-import sys
-import os
-import re
-from functools import lru_cache
-from . import ExitCode
-
-
-@lru_cache(maxsize=1)
-def version():
-    args_tess = [
-        'tesseract',
-        '--version'
-    ]
-    try:
-        versions = check_output(
-                args_tess, close_fds=True, universal_newlines=True,
-                stderr=STDOUT)
-    except CalledProcessError:
-        print("Could not find Tesseract executable on system PATH.")
-        sys.exit(ExitCode.missing_dependency)
-
-    tesseract_version = re.match(r'tesseract\s(.+)', versions).group(1)
-    return tesseract_version
-
-
-@lru_cache(maxsize=1)
-def languages():
-    args_tess = [
-        'tesseract',
-        '--list-langs'
-    ]
-    try:
-        langs = check_output(
-                args_tess, close_fds=True, universal_newlines=True,
-                stderr=STDOUT)
-    except CalledProcessError as e:
-        print("Tesseract failed to report available languages.")
-        print("Output from Tesseract:")
-        print("-" * 40)
-        print(e.output)
-        sys.exit(ExitCode.missing_dependency)
-    return set(lang.strip() for lang in langs.splitlines()[1:])
-
-
-HOCR_TEMPLATE = '''<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
- <head>
-  <title></title>
-  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-  <meta name='ocr-system' content='tesseract 3.02.02' />
-  <meta name='ocr-capabilities' content='ocr_page ocr_carea ocr_par ocr_line ocrx_word'/>
- </head>
- <body>
-  <div class='ocr_page' id='page_1' title='image "x.tif"; bbox 0 0 {0} {1}; ppageno 0'>
-   <div class='ocr_carea' id='block_1_1' title="bbox 0 1 {0} {1}">
-    <p class='ocr_par' dir='ltr' id='par_1' title="bbox 0 1 {0} {1}">
-     <span class='ocr_line' id='line_1' title="bbox 0 1 {0} {1}"><span class='ocrx_word' id='word_1' title="bbox 0 1 {0} {1}"> </span>
-     </span>
-    </p>
-   </div>
-  </div>
- </body>
-</html>'''

ocrmypdf/test/test_pageinfo.py

@@ -1,111 +0,0 @@
-#!/usr/bin/env python3
-# © 2015 James R. Barlow: github.com/jbarlow83
-
-from ocrmypdf import pageinfo
-from reportlab.pdfgen.canvas import Canvas
-from PIL import Image
-from tempfile import NamedTemporaryFile
-from contextlib import suppress
-import os
-import shutil
-import pytest
-import img2pdf
-from pkg_resources import Requirement, resource_filename
-import pytest
-
-req = Requirement.parse('ocrmypdf')
-
-TEST_OUTPUT = os.environ.get(
-    'OCRMYPDF_TEST_OUTPUT',
-    default=os.path.join(os.path.dirname(__file__), 'output'))
-
-
-def setup_module():
-    with suppress(FileNotFoundError):
-        shutil.rmtree(TEST_OUTPUT)
-    with suppress(FileExistsError):
-        os.mkdir(TEST_OUTPUT)
-
-
-def test_single_page_text():
-    filename = os.path.join(TEST_OUTPUT, 'text.pdf')
-    pdf = Canvas(filename, pagesize=(8*72, 6*72))
-    text = pdf.beginText()
-    text.setFont('Helvetica', 12)
-    text.setTextOrigin(1*72, 3*72)
-    text.textLine("Methink'st thou art a general offence and every"
-                  " man should beat thee.")
-    pdf.drawText(text)
-    pdf.showPage()
-    pdf.save()
-
-    pdfinfo = pageinfo.pdf_get_all_pageinfo(filename)
-
-    assert len(pdfinfo) == 1
-    page = pdfinfo[0]
-
-    assert page['has_text']
-    assert len(page['images']) == 0
-
-
-def test_single_page_image():
-    filename = os.path.join(TEST_OUTPUT, 'image-mono.pdf')
-
-    with NamedTemporaryFile() as im_tmp:
-        im = Image.new('1', (8, 8), 0)
-        for n in range(8):
-            im.putpixel((n, n), 1)
-        im.save(im_tmp.name, format='PNG')
-
-        pdf_bytes = img2pdf.convert([im_tmp.name], dpi=8)
-        with open(filename, 'wb') as pdf:
-            pdf.write(pdf_bytes)
-
-    pdfinfo = pageinfo.pdf_get_all_pageinfo(filename)
-
-    assert len(pdfinfo) == 1
-    page = pdfinfo[0]
-
-    assert not page['has_text']
-    assert len(page['images']) == 1
-
-    pdfimage = page['images'][0]
-    assert pdfimage['width'] == 8
-    assert pdfimage['color'] == 'gray'
-
-    # While unexpected, this is correct
-    # PDF spec says /FlateDecode image must have /BitsPerComponent 8
-    # So mono images get upgraded to 8-bit
-    assert pdfimage['bpc'] == 8
-
-    # DPI in a 1"x1" is the image width
-    assert pdfimage['dpi_w'] == 8
-    assert pdfimage['dpi_h'] == 8
-
-
-def test_single_page_inline_image():
-    filename = os.path.join(TEST_OUTPUT, 'image-mono-inline.pdf')
-    pdf = Canvas(filename, pagesize=(8*72, 6*72))
-    with NamedTemporaryFile() as im_tmp:
-        im = Image.new('1', (8, 8), 0)
-        for n in range(8):
-            im.putpixel((n, n), 1)
-        im.save(im_tmp.name, format='PNG')
-        # Draw image in a 72x72 pt or 1"x1" area
-        pdf.drawInlineImage(im_tmp.name, 0, 0, width=72, height=72)
-        pdf.showPage()
-        pdf.save()
-
-    with pytest.raises(NotImplementedError):
-        pageinfo.pdf_get_all_pageinfo(filename)
-
-
-@pytest.mark.skipif(True, reason="need to fix packaging error")
-def test_jpeg():
-    filename = resource_filename(req, 'tests/resources/c02-22.pdf')
-
-    pdfinfo = pageinfo.pdf_get_all_pageinfo(filename)
-
-    pdfimage = pdfinfo[0]['images'][0]
-    assert pdfimage['enc'] == 'jpeg'
-

pipeline.svg

@@ -1,235 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.38.0 (20140413.2041)
- -->
-<!-- Title: Pipeline: Pages: 1 -->
-<svg width="728pt" height="651pt"
- viewBox="0.00 0.00 728.00 650.53" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 646.53)">
-<title>Pipeline:</title>
-<polygon fill="white" stroke="none" points="-4,4 -4,-646.53 724,-646.53 724,4 -4,4"/>
-<g id="clust1" class="cluster"><title>clustertasks</title>
-<polygon fill="none" stroke="black" points="8,-8 8,-634.53 712,-634.53 712,-8 8,-8"/>
-<text text-anchor="middle" x="360" y="-606.53" font-family="Times,serif" font-size="30.00" fill="#ff3232">Pipeline:</text>
-</g>
-<!-- t0 -->
-<g id="node1" class="node"><title>t0</title>
-<polygon fill="#efa03b" stroke="#006000" points="481.791,-588.53 386.209,-588.53 382.209,-584.53 382.209,-552.53 477.791,-552.53 481.791,-556.53 481.791,-588.53"/>
-<polyline fill="none" stroke="#006000" points="477.791,-584.53 382.209,-584.53 "/>
-<polyline fill="none" stroke="#006000" points="477.791,-584.53 477.791,-552.53 "/>
-<polyline fill="none" stroke="#006000" points="477.791,-584.53 481.791,-588.53 "/>
-<text text-anchor="middle" x="432" y="-564.53" font-family="Times,serif" font-size="20.00" fill="#006000">repair_pdf</text>
-</g>
-<!-- t1 -->
-<g id="node2" class="node"><title>t1</title>
-<polygon fill="#efa03b" stroke="black" points="466.782,-509.564 374,-526.497 281.218,-509.564 281.304,-482.165 466.696,-482.165 466.782,-509.564"/>
-<polygon fill="none" stroke="black" points="470.799,-512.902 374,-530.569 277.201,-512.902 277.311,-478.159 470.689,-478.159 470.799,-512.902"/>
-<text text-anchor="middle" x="374" y="-495.991" font-family="Times,serif" font-size="20.00">split_pages</text>
-</g>
-<!-- t0&#45;&gt;t1 -->
-<g id="edge1" class="edge"><title>t0&#45;&gt;t1</title>
-<path fill="none" stroke="gray" d="M417.064,-552.394C412.296,-546.925 406.86,-540.689 401.493,-534.532"/>
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requirements.txt

@@ -1,4 +0,0 @@
-ruffus>=2.6.3
-Pillow>=2.4.0
-reportlab>=3.1.44
-PyPDF2>=1.25.1

requirements/dev.txt

@@ -0,0 +1,4 @@
+check-manifest >= 0.35
+twine >= 1.8.1
+coverage >= 4.4
+GitPython == 2.1.3

requirements/main.txt

@@ -0,0 +1,11 @@
+# requirements.txt can be used to replicate the developer's build environment
+# setup.py lists a separate set of requirements that are looser to simplify
+# installation
+cffi == 1.11.5
+img2pdf == 0.3.0
+pikepdf == 0.3.4
+Pillow >= 5.0.0, != 5.1.0 ; sys_platform == "darwin"
+pycparser == 2.18
+python-xmp-toolkit == 2.0.1
+reportlab == 3.4.0
+ruffus == 2.7.0

requirements/test.txt

@@ -0,0 +1,8 @@
+pytest >= 3.2
+pytest-helpers-namespace
+pytest-xdist
+pytest-cov
+python-xmp-toolkit   # requires apt-get install libexempi3
+                     # or brew install exempi
+PyPDF2 >= 1.26.0
+#PyMuPDF == 1.13.4    # optional

setup.cfg

@@ -1,4 +1,16 @@
 [bdist_wheel]
-python-tag = py34
-[pytest]
-norecursedirs = lib 
+python-tag = py35
+
+[aliases]
+test=pytest
+
+[check-manifest]
+ignore =
+	.github
+
+[tool:pytest]
+norecursedirs = lib .pc .git output cache resources
+testpaths = tests
+
+[metadata]
+license_file = LICENSE

setup.py

@@ -1,12 +1,34 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
 # © 2015 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function, unicode_literals
 
-from setuptools import setup
-from subprocess import Popen, STDOUT, check_output, CalledProcessError
-from string import Template
-from collections.abc import Mapping
-import re
 import sys
+if sys.version_info < (3, 5):
+    print("Python 3.5 or newer is required", file=sys.stderr)
+    sys.exit(1)
+
+from setuptools import setup, find_packages  # nopep8
+from subprocess import STDOUT, check_output, CalledProcessError  # nopep8
+from collections.abc import Mapping  # nopep8
+import re  # nopep8
+import os  # nopep8
 
 
 missing_program = '''
@@ -142,59 +164,71 @@ def check_external_program(
 
 
 command = next((arg for arg in sys.argv[1:] if not arg.startswith('-')), '')
+forced = ('--force' in sys.argv)
 
 
-if command.startswith('install') or \
-        command in ['check', 'test', 'nosetests', 'easy_install', 'egg_info']:
+if not forced and command.startswith('install') or \
+        command in ['check', 'test', 'nosetests', 'easy_install']:
     check_external_program(
         program='tesseract',
-        need_version='3.02.02',
+        need_version='3.04',  # using backport for Travis CI
         package={'darwin': 'tesseract', 'linux': 'tesseract-ocr'}
     )
     check_external_program(
         program='gs',
-        need_version='9.14',
+        need_version='9.15',  # limited by Travis CI / Ubuntu 14.04 backports
         package='ghostscript'
     )
     check_external_program(
         program='unpaper',
-        need_version='6.1',
+        need_version='6.1',   # latest sane version
         package='unpaper',
         optional=True
     )
     check_external_program(
         program='qpdf',
-        need_version='5.0.0',
-        package='qpdf',
-        version_check_args=['--version']
+        need_version='8.0.2', # test suite known to fail on 5.1.1
+        package='qpdf'
+    )
+    check_external_program(
+        program='pngquant',
+        need_version='2.0.0',
+        package='pngquant',
+        optional=True
     )
-
 
 if 'upload' in sys.argv[1:]:
     print('Use twine to upload the package - setup.py upload is insecure')
     sys.exit(1)
 
-install_requires = open('requirements.txt').read().splitlines()
-tests_require = open('test_requirements.txt').read().splitlines()
+tests_require = open('requirements/test.txt', encoding='utf-8').read().splitlines()
+
+
+def readme():
+    with open('README.md', encoding='utf-8') as f:
+        return f.read()
 
 setup(
     name='ocrmypdf',
-    version='3.1',  # also update: release notes, main.py
     description='OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched',
+    long_description=readme(),
+    long_description_content_type='text/markdown',
     url='https://github.com/jbarlow83/OCRmyPDF',
     author='James R. Barlow',
     author_email='jim@purplerock.ca',
-    license='Public Domain',
-    packages=['ocrmypdf'],
+    packages=find_packages('src', exclude=["tests", "tests.*"]),
+    package_dir={'': 'src'},
     keywords=['PDF', 'OCR', 'optical character recognition', 'PDF/A', 'scanning'],
     classifiers=[
-        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
         "Intended Audience :: End Users/Desktop",
         "Intended Audience :: Science/Research",
         "Intended Audience :: System Administrators",
-        "License :: Public Domain",
+        "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
         "Operating System :: MacOS :: MacOS X",
         "Operating System :: POSIX",
         "Operating System :: POSIX :: BSD",
@@ -203,12 +237,43 @@ setup(
         "Topic :: Text Processing :: Indexing",
         "Topic :: Text Processing :: Linguistic",
         ],
-    install_requires=install_requires,
+    python_requires=' >= 3.5',
+    setup_requires=[
+        'cffi >= 1.9.1',        # to build the leptonica module
+        'pytest-runner',        # to enable python setup.py test
+        'setuptools_scm',       # so that version will work
+        'setuptools_scm_git_archive'    # enable version from github tarballs
+    ],
+    use_scm_version={'version_scheme': 'post-release'},
+    cffi_modules=[
+        'src/ocrmypdf/lib/compile_leptonica.py:ffibuilder'
+    ],
+    install_requires=[
+        'cffi >= 1.9.1',          # must be a setup and install requirement
+        'img2pdf >= 0.2.4, < 0.4',       # pure Python, so track HEAD closely
+        'pikepdf >= 0.3.3, < 0.4',
+        'Pillow >= 4.0.0, != 5.1.0 ; sys_platform == "darwin"',
+                                  # Pillow < 4 has BytesIO/TIFF bug w/img2pdf 0.2.3
+                                  # block 5.1.0, broken wheels
+        'python-xmp-toolkit >= 2, < 3',
+        'reportlab >= 3.3.0',     # oldest released version with sane image handling
+        'ruffus >= 2.7.0',
+    ],
+    extras_require={
+        'fitz': [],  # Backward compatibility
+    },
     tests_require=tests_require,
     entry_points={
         'console_scripts': [
-            'ocrmypdf = ocrmypdf.main:run_pipeline'
+            'ocrmypdf = ocrmypdf.__main__:run_pipeline'
         ],
     },
+    package_data={'ocrmypdf': ['data/sRGB.icc']},
     include_package_data=True,
-    zip_safe=False)
+    zip_safe=False,
+    project_urls={
+        'Documentation': 'https://ocrmypdf.readthedocs.io/',
+        'Source': 'https://github.com/jbarlow83/ocrmypdf',
+        'Tracker': 'https://github.com/jbarlow83/ocrmypdf/issues'
+    }
+)

src/ocrmypdf/__init__.py

@@ -0,0 +1,38 @@
+# © 2017 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+import pkg_resources
+
+PROGRAM_NAME = 'ocrmypdf'
+
+# Official PEP 396
+__version__ = pkg_resources.get_distribution('ocrmypdf').version
+
+VERSION = __version__
+
+from .exceptions import (
+    ExitCode, BadArgsError, PdfMergeFailedError, MissingDependencyError,
+    UnsupportedImageFormatError, DpiError, OutputFileAccessError,
+    PriorOcrFoundError, InputFileError, SubprocessOutputError,
+    EncryptedPdfError, TesseractConfigError
+)
+
+from . import helpers
+from . import hocrtransform
+from . import leptonica
+from . import pdfa
+from . import pdfinfo

src/ocrmypdf/__main__.py

@@ -0,0 +1,993 @@
+#!/usr/bin/env python3
+# © 2015-17 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from tempfile import mkdtemp
+from pathlib import Path
+import sys
+import os
+import re
+import atexit
+import textwrap
+import logging
+import argparse
+
+import PIL
+
+import ruffus.ruffus_exceptions as ruffus_exceptions
+import ruffus.cmdline as cmdline
+import ruffus.proxy_logger as proxy_logger
+
+from ._jobcontext import JobContext, JobContextManager, cleanup_working_files
+from ._pipeline import build_pipeline
+from .pdfa import file_claims_pdfa
+from .helpers import re_symlink, is_file_writable, \
+    available_cpu_count
+from .exec import tesseract, qpdf, ghostscript
+from . import PROGRAM_NAME, VERSION
+
+from .exceptions import ExitCode, ExitCodeException, MissingDependencyError, \
+    InputFileError, BadArgsError, OutputFileAccessError
+from . import exceptions as ocrmypdf_exceptions
+from ._unicodefun import verify_python3_env
+
+
+# -------------
+# External dependencies
+
+MINIMUM_TESS_VERSION = '3.04'
+
+HOCR_OK_LANGS = frozenset([
+    'eng', 'deu', 'spa', 'ita', 'por'
+])
+
+def complain(message):
+    print(*textwrap.wrap(message), file=sys.stderr)
+
+
+# Hack to help debugger context find /usr/local/bin
+if 'IDE_PROJECT_ROOTS' in os.environ:
+    os.environ['PATH'] = '/usr/local/bin:' + os.environ['PATH']
+
+# --------
+# Critical environment tests
+
+verify_python3_env()
+
+if tesseract.version() < MINIMUM_TESS_VERSION:
+    complain(
+        "Please install tesseract {0} or newer "
+        "(currently installed version is {1})".format(
+            MINIMUM_TESS_VERSION, tesseract.version()))
+    sys.exit(ExitCode.missing_dependency)
+
+# -------------
+# Parser
+
+def numeric(basetype, min_=None, max_=None):
+    """Validator for numeric params"""
+    min_ = basetype(min_) if min_ is not None else None
+    max_ = basetype(max_) if max_ is not None else None
+    def _numeric(string):
+        value = basetype(string)
+        if (min_ is not None and value < min_
+                or max_ is not None and value > max_):
+            msg = "%r not in valid range %r" % (string, (min_, max_))
+            raise argparse.ArgumentTypeError(msg)
+        return value
+    _numeric.__name__ = basetype.__name__
+    return _numeric
+
+
+parser = argparse.ArgumentParser(
+    prog=PROGRAM_NAME,
+    fromfile_prefix_chars='@',
+    formatter_class=argparse.RawDescriptionHelpFormatter,
+    description="""\
+Generates a searchable PDF or PDF/A from a regular PDF.
+
+OCRmyPDF rasterizes each page of the input PDF, optionally corrects page
+rotation and performs image processing, runs the Tesseract OCR engine on the
+image, and then creates a PDF from the OCR information.
+""",
+    epilog="""\
+OCRmyPDF attempts to keep the output file at about the same size.  If a file
+contains losslessly compressed images, and output file will be losslessly
+compressed as well.
+
+PDF is a page description file that attempts to preserve a layout exactly.
+A PDF can contain vector objects (such as text or lines) and raster objects
+(images).  A page might have multiple images.  OCRmyPDF is prepared to deal
+with the wide variety of PDFs that exist in the wild.
+
+When a PDF page contains text, OCRmyPDF assumes that the page has already
+been OCRed or is a "born digital" page that should not be OCRed.  The default
+behavior is to exit in this case without producing a file.  You can use the
+option --skip-text to ignore pages with text, or --force-ocr to rasterize
+all objects on the page and produce an image-only PDF as output.
+
+    ocrmypdf --skip-text file_with_some_text_pages.pdf output.pdf
+
+    ocrmypdf --force-ocr word_document.pdf output.pdf
+
+If you are concerned about long-term archiving of PDFs, use the default option
+--output-type pdfa which converts the PDF to a standardized PDF/A-2b.  This
+converts images to sRGB colorspace, removes some features from the PDF such
+as Javascript or forms. If you want to minimize the number of changes made to
+your PDF, use --output-type pdf.
+
+If OCRmyPDF is given an image file as input, it will attempt to convert the
+image to a PDF before processing.  For more control over the conversion of
+images to PDF, use the Python package img2pdf or other image to PDF software.
+
+For example, this command uses img2pdf to convert all .png files beginning
+with the 'page' prefix to a PDF, fitting each image on A4-sized paper, and
+sending the result to OCRmyPDF through a pipe.  img2pdf is a dependency of
+ocrmypdf so it is already installed.
+
+    img2pdf --pagesize A4 page*.png | ocrmypdf - myfile.pdf
+
+Online documentation is located at:
+    https://ocrmypdf.readthedocs.io/en/latest/introduction.html
+
+""")
+
+parser.add_argument(
+    'input_file', metavar="input_pdf_or_image",
+    help="PDF file containing the images to be OCRed (or '-' to read from "
+         "standard input)")
+parser.add_argument(
+    'output_file', metavar="output_pdf",
+    help="Output searchable PDF file (or '-' to write to standard output). "
+         "Existing files will be ovewritten. If same as input file, the "
+         "input file will be updated only if processing is successful.")
+parser.add_argument(
+    '-l', '--language', action='append',
+    help="Language(s) of the file to be OCRed (see tesseract --list-langs for "
+         "all language packs installed in your system). Use -l eng+deu for "
+         "multiple languages.")
+parser.add_argument(
+    '--image-dpi', metavar='DPI', type=int,
+    help="For input image instead of PDF, use this DPI instead of file's.")
+parser.add_argument(
+    '--output-type', choices=['pdfa', 'pdf', 'pdfa-1', 'pdfa-2', 'pdfa-3'],
+    default='pdfa',
+    help="Choose output type. 'pdfa' creates a PDF/A-2b compliant file for "
+         "long term archiving (default, recommended) but may not suitable "
+         "for users who want their file altered as little as possible. 'pdfa' "
+         "also has problems with full Unicode text. 'pdf' attempts to "
+         "preserve file contents as much as possible. 'pdf-a1' creates a "
+         "PDF/A1-b file. 'pdf-a2' is equivalent to 'pdfa'. 'pdf-a3' creates a "
+         "PDF/A3-b file."
+         )
+
+# Use null string '\0' as sentinel to indicate the user supplied no argument,
+# since that is the only invalid character for filepaths on all platforms
+# bool('\0') is True in Python
+parser.add_argument(
+    '--sidecar', nargs='?', const='\0', default=None, metavar='FILE',
+    help="Generate sidecar text files that contain the same text recognized "
+         "by Tesseract. This may be useful for building a OCR text database. "
+         "If FILE is omitted, the sidecar file be named {output_file}.txt "
+         "If FILE is set to '-', the sidecar is written to stdout (a "
+         "convenient way to preview OCR quality). The output file and sidecar "
+         "may not both use stdout at the same time.")
+
+parser.add_argument(
+    '--version', action='version', version=VERSION,
+    help="Print program version and exit")
+
+jobcontrol = parser.add_argument_group(
+    "Job control options")
+jobcontrol.add_argument(
+    '-j', '--jobs', metavar='N', type=numeric(int, 0, 256),
+    help="Use up to N CPU cores simultaneously (default: use all).")
+jobcontrol.add_argument(
+    '-q', '--quiet', action='store_true', help="Suppress INFO messages")
+jobcontrol.add_argument(
+    '-v', '--verbose', const="+", default=[], nargs='?', action="append",
+    help="Print more verbose messages for each additional verbose level")
+
+metadata = parser.add_argument_group(
+    "Metadata options",
+    "Set output PDF/A metadata (default: copy input document's metadata)")
+metadata.add_argument(
+    '--title', type=str,
+    help="Set document title (place multiple words in quotes)")
+metadata.add_argument(
+    '--author', type=str,
+    help="Set document author")
+metadata.add_argument(
+    '--subject', type=str,
+    help="Set document subject description")
+metadata.add_argument(
+    '--keywords', type=str,
+    help="Set document keywords")
+
+preprocessing = parser.add_argument_group(
+    "Image preprocessing options",
+    "Options to improve the quality of the final PDF and OCR")
+preprocessing.add_argument(
+    '-r', '--rotate-pages', action='store_true',
+    help="Automatically rotate pages based on detected text orientation")
+preprocessing.add_argument(
+    '--remove-background', action='store_true',
+    help="Attempt to remove background from gray or color pages, setting it "
+         "to white ")
+preprocessing.add_argument(
+    '-d', '--deskew', action='store_true',
+    help="Deskew each page before performing OCR")
+preprocessing.add_argument(
+    '-c', '--clean', action='store_true',
+    help="Clean pages from scanning artifacts before performing OCR, and send "
+         "the cleaned page to OCR, but do not include the cleaned page in "
+         "the output")
+preprocessing.add_argument(
+    '-i', '--clean-final', action='store_true',
+    help="Clean page as above, and incorporate the cleaned image in the final "
+         "PDF.  Might remove desired content.")
+preprocessing.add_argument(
+    '--oversample', metavar='DPI', type=numeric(int, 0, 5000), default=0,
+    help="Oversample images to at least the specified DPI, to improve OCR "
+         "results slightly")
+
+ocrsettings = parser.add_argument_group(
+    "OCR options",
+    "Control how OCR is applied")
+ocrsettings.add_argument(
+    '-f', '--force-ocr', action='store_true',
+    help="Rasterize any fonts or vector objects on each page, apply OCR, and "
+         "save the rastered output (this rewrites the PDF)")
+ocrsettings.add_argument(
+    '-s', '--skip-text', action='store_true',
+    help="Skip OCR on any pages that already contain text, but include the "
+         "page in final output; useful for PDFs that contain a mix of "
+         "images, text pages, and/or previously OCRed pages")
+ocrsettings.add_argument(
+    '--skip-big', type=numeric(float, 0, 5000), metavar='MPixels',
+    help="Skip OCR on pages larger than the specified amount of megapixels, "
+         "but include skipped pages in final output")
+
+optimizing = parser.add_argument_group(
+    "Optimization options",
+    "Control how the PDF is optimized after OCR"
+)
+optimizing.add_argument(
+    '-O', '--optimize', type=int, choices=range(0, 4), default=1,
+    help=("Control how PDF is optimized after processing:"
+        "0 - do not optimize; "
+        "1 - do safe, lossless optimizations (default); "
+        "2 - do some lossy optimizations; "
+        "3 - do aggressive lossy optimizations (including lossy JBIG2)"
+    )
+)
+optimizing.add_argument(
+    '--jpeg-quality', type=numeric(int, 0, 100), default=0, metavar='Q',
+    help=("Adjust JPEG quality level for JPEG optimization. "
+          "100 is best quality and largest output size; "
+          "1 is lowest quality and smallest output; "
+          "0 uses the default."
+    )
+)
+optimizing.add_argument(
+    '--jpg-quality', type=numeric(int, 0, 100), default=0, metavar='Q',
+    dest='jpeg_quality',
+    help=argparse.SUPPRESS  # Alias for --jpeg-quality
+)
+optimizing.add_argument(
+    '--png-quality', type=numeric(int, 0, 100), default=0, metavar='Q',
+    help=("Adjust PNG quality level to use when quantizing PNGs. "
+          "Values have same meaning as with --jpeg-quality"
+    )
+)
+optimizing.add_argument(
+    '--jbig2-lossy', action='store_true',
+    help=("Enable JBIG2 lossy mode (better compression, not suitable for some "
+          "use cases - see documentation)."
+    )
+)
+optimizing.add_argument(
+    '--jbig2-page-group-size', type=numeric(int, 1, 10000), default=0,
+    metavar='N',
+    # Adjust number of pages to consider at once for JBIG2 compression
+    help=argparse.SUPPRESS
+)
+
+advanced = parser.add_argument_group(
+    "Advanced",
+    "Advanced options to control Tesseract's OCR behavior")
+advanced.add_argument(
+    '--max-image-mpixels', action='store', type=numeric(float, 0),
+    metavar='MPixels',
+    help="Set maximum number of pixels to unpack before treating an image as a "
+         "decompression bomb",
+    default=128.0)
+advanced.add_argument(
+    '--tesseract-config', action='append', metavar='CFG', default=[],
+    help="Additional Tesseract configuration files -- see documentation")
+advanced.add_argument(
+    '--tesseract-pagesegmode', action='store', type=int, metavar='PSM',
+    choices=range(0, 14),
+    help="Set Tesseract page segmentation mode (see tesseract --help)")
+advanced.add_argument(
+    '--tesseract-oem', action='store', type=int, metavar='MODE',
+    choices=range(0, 4),
+    help=("Set Tesseract 4.0 OCR engine mode: "
+         "0 - original Tesseract only; "
+         "1 - neural nets LSTM only; "
+         "2 - Tesseract + LSTM; "
+         "3 - default.")
+    )
+advanced.add_argument(
+    '--pdf-renderer',
+    choices=['auto', 'hocr', 'sandwich'], default='auto',
+    help="Choose OCR PDF renderer - the default option is to let OCRmyPDF "
+         "choose.  See documentation for discussion."
+    )
+advanced.add_argument(
+    '--tesseract-timeout', default=180.0, type=numeric(float, 0),
+    metavar='SECONDS',
+    help='Give up on OCR after the timeout, but copy the preprocessed page '
+         'into the final output')
+advanced.add_argument(
+    '--rotate-pages-threshold', default=14.0, type=numeric(float, 0, 1000),
+    metavar='CONFIDENCE',
+    help="Only rotate pages when confidence is above this value (arbitrary "
+         "units reported by tesseract)")
+advanced.add_argument(
+    '--pdfa-image-compression', choices=['auto', 'jpeg', 'lossless'],
+    default='auto',
+    help="Specify how to compress images in the output PDF/A. 'auto' lets "
+         "OCRmyPDF decide.  'jpeg' changes all grayscale and color images to "
+         "JPEG compression.  'lossless' uses PNG-style lossless compression "
+         "for all images.  Monochrome images are always compressed using a "
+         "lossless codec.  Compression settings "
+         "are applied to all pages, including those for which OCR was "
+         "skipped.  Not supported for --output-type=pdf ; that setting "
+         "preserves the original compression of all images.")
+advanced.add_argument(
+    '--user-words', metavar='FILE',
+    help="Specify the location of the Tesseract user words file. This is a "
+         "list of words Tesseract should consider while performing OCR in "
+         "addition to its standard language dictionaries. This can improve "
+         "OCR quality especially for specialized and technical documents.")
+advanced.add_argument(
+    '--user-patterns', metavar='FILE',
+    help="Specify the location of the Tesseract user patterns file.")
+
+debugging = parser.add_argument_group(
+    "Debugging",
+    "Arguments to help with troubleshooting and debugging")
+debugging.add_argument(
+    '-k', '--keep-temporary-files', action='store_true',
+    help="Keep temporary files (helpful for debugging)")
+debugging.add_argument(
+    '--flowchart', type=str,
+    help="Generate the pipeline execution flowchart")
+
+
+def check_options_languages(options, _log):
+    if not options.language:
+        options.language = ['eng']  # Enforce English hegemony
+
+    # Support v2.x "eng+deu" language syntax
+    if '+' in options.language[0]:
+        options.language = options.language[0].split('+')
+
+    languages = set(options.language)
+    if not languages.issubset(tesseract.languages()):
+        msg = (
+            "The installed version of tesseract does not have language "
+            "data for the following requested languages: \n")
+        for lang in (languages - tesseract.languages()):
+            msg += lang + '\n'
+        raise MissingDependencyError(msg)
+
+
+def check_options_output(options, log):
+    # We have these constraints to check for.
+    # 1. Ghostscript < 9.20 mangles multibyte Unicode
+    # 2. Tesseract < 3.05 embeds an older version of GlyphlessFont with which
+    #    no version of Ghostscript handles correctly.
+    # 3. hocr doesn't work on non-Latin languages (so don't select it)
+
+    languages = set(options.language)
+    is_latin = languages.issubset(HOCR_OK_LANGS)
+
+    if options.pdf_renderer == 'hocr' and not is_latin:
+        msg = (
+            "The 'hocr' PDF renderer is known to cause problems with one "
+            "or more of the languages in your document.  Use "
+            "--pdf-renderer auto (the default) to avoid this issue.")
+        log.warning(msg)
+
+    if ghostscript.version() < '9.20' \
+            and options.output_type != 'pdf' \
+            and not is_latin:
+        # https://bugs.ghostscript.com/show_bug.cgi?id=696874
+        # Ghostscript < 9.20 fails to encode multibyte characters properly
+        msg = (
+            "The installed version of Ghostscript does not work correctly "
+            "with the OCR languages you specified. Use --output-type pdf or "
+            "upgrade to Ghostscript 9.20 or later to avoid this issue.")
+        msg += "Found Ghostscript {}".format(ghostscript.version())
+        log.warning(msg)
+
+    # Decide on what renderer to use
+    if options.pdf_renderer == 'auto':
+        if tesseract.version() < '3.05' \
+                and options.output_type.startswith('pdfa') \
+                and is_latin:
+            options.pdf_renderer = 'hocr'
+        else:
+            options.pdf_renderer = 'sandwich'
+
+    if options.pdf_renderer == 'sandwich' \
+            and tesseract.version() < '3.05':
+        msg = (
+            "Ghostscript will corrupt the OCR text of PDFs produced by "
+            "Tesseract 3.04.xx and older.  For best results, upgrade to a "
+            "newer release of Tesseract. "
+        )
+
+        if options.output_type.startswith('pdfa'):
+            msg += (
+                "The argument --output-type=pdfa* requires Ghostscript, so "
+                "the PDF will be invalid.  If you cannot upgrade Tesseract, "
+                "use --output-type=pdf.")
+            raise MissingDependencyError(msg)
+        log.warning(msg)
+
+    if options.output_type == 'pdfa':
+        options.output_type = 'pdfa-2'
+
+    if options.output_type == 'pdfa-3' and ghostscript.version() < '9.19':
+        raise MissingDependencyError(
+            "--output-type pdfa-3 requires Ghostscript 9.19 or later"
+        )
+
+    lossless_reconstruction = False
+    if options.pdf_renderer in ('hocr', 'sandwich'):
+        if not any((options.deskew, options.clean_final, options.force_ocr,
+                   options.remove_background)):
+            lossless_reconstruction = True
+    options.lossless_reconstruction = lossless_reconstruction
+
+
+def check_options_sidecar(options, log):
+    if options.sidecar == '\0':
+        if options.output_file == '-':
+            raise argparse.ArgumentError(
+                None,
+                "--sidecar filename must be specified when output file is "
+                "stdout.")
+        options.sidecar = options.output_file + '.txt'
+
+
+def _optional_program_required(name, version_fn, min_version, for_argument):
+    try:
+        if version_fn() < min_version:
+            raise MissingDependencyError(
+                "The installed '{}' is not supported. "
+                "Install version {} or newer.".format(name, min_version))
+    except (FileNotFoundError, MissingDependencyError):
+        raise MissingDependencyError(
+            "Install the '{}' program to use {}.".format(name, for_argument))
+
+
+def _optional_program_recommended(name, version_fn, min_version, for_argument):
+    try:
+        if version_fn() < min_version:
+            raise MissingDependencyError(
+                "The installed '{}' is not supported. "
+                "Install version {} or newer.".format(name, min_version))
+    except (FileNotFoundError, MissingDependencyError):
+        complain(
+            "For best results, install the optional program '{}' to use the "
+            "argument {}.".format(name, for_argument)
+        )
+
+
+def check_options_preprocessing(options, log):
+    if any((options.clean, options.clean_final)):
+        from .exec import unpaper
+        _optional_program_required(
+            'unpaper', unpaper.version, '6.1', '--clean, --clean-final'
+        )
+
+
+def check_options_ocr_behavior(options, log):
+    if options.force_ocr and options.skip_text:
+        raise argparse.ArgumentError(
+            None,
+            "Error: --force-ocr and --skip-text are mutually exclusive.")
+
+
+def check_options_optimizing(options, log):
+    if options.optimize >= 2:
+        from .exec import pngquant, jbig2enc
+        _optional_program_required(
+            'pngquant', pngquant.version, '2.0.1', '--optimize {2,3}'
+        )
+
+    if options.jbig2_lossy:
+        _optional_program_required(
+            'jbig2', jbig2enc.version, '0.28', '--jbig2-lossy'
+        )
+    elif options.optimize >= 2:
+        # Although we use JBIG2 for optimize=1, don't nag about it unless the
+        # user is asking for more optimization
+        _optional_program_recommended(
+            'jbig2', jbig2enc.version, '0.28', '--optimize {2,3}'
+        )
+
+    if options.optimize == 0 and any([
+            options.jbig2_lossy, options.png_quality, options.jpeg_quality
+            ]):
+        log.warning(
+            "The arguments --jbig2-lossy, --png-quality, and --jpeg-quality "
+            "will be ignored because --optimize=0."
+        )
+
+
+def check_options_advanced(options, log):
+    if options.tesseract_oem and not tesseract.v4():
+        log.warning(
+            "--tesseract-oem requires Tesseract 4.x -- argument ignored")
+    if options.pdfa_image_compression != 'auto' and \
+            options.output_type.startswith('pdfa'):
+        log.warning(
+            "--pdfa-image-compression argument has no effect when "
+            "--output-type is not 'pdfa', 'pdfa-1', or 'pdfa-2'"
+        )
+
+    if tesseract.v4() and (options.user_words or options.user_patterns):
+        log.warning(
+            'Tesseract 4.x ignores --user-words, so this has no effect')
+
+
+def check_options_metadata(options, log):
+    import unicodedata
+    docinfo = [options.title, options.author, options.keywords,
+               options.subject]
+    for s in (m for m in docinfo if m):
+        for c in s:
+            if unicodedata.category(c) == 'Co' or ord(c) >= 0x10000:
+                raise ValueError(
+                    "One of the metadata strings contains "
+                    "an unsupported Unicode character: '{}' (U+{})".format(
+                        c, hex(ord(c))[2:].upper()
+                ))
+
+
+def check_options_pillow(options, log):
+    PIL.Image.MAX_IMAGE_PIXELS = int(options.max_image_mpixels * 1000000)
+    if PIL.Image.MAX_IMAGE_PIXELS == 0:
+        PIL.Image.MAX_IMAGE_PIXELS = None
+
+
+def check_options(options, log):
+    try:
+        check_options_languages(options, log)
+        check_options_metadata(options, log)
+        check_options_output(options, log)
+        check_options_sidecar(options, log)
+        check_options_preprocessing(options, log)
+        check_options_ocr_behavior(options, log)
+        check_options_optimizing(options, log)
+        check_options_advanced(options, log)
+        check_options_pillow(options, log)
+    except ValueError as e:
+        log.error(e)
+        sys.exit(ExitCode.bad_args)
+    except argparse.ArgumentError as e:
+        log.error(e)
+        sys.exit(ExitCode.bad_args)
+    except MissingDependencyError as e:
+        log.error(e)
+        sys.exit(ExitCode.missing_dependency)
+
+
+# ----------
+# Logging
+
+
+def logging_factory(logger_name, logger_args):
+    verbose = logger_args['verbose']
+    quiet = logger_args['quiet']
+
+    root_logger = logging.getLogger(logger_name)
+    root_logger.setLevel(logging.DEBUG)
+
+    handler = logging.StreamHandler(sys.stderr)
+    formatter_ = logging.Formatter("%(levelname)7s - %(message)s")
+    handler.setFormatter(formatter_)
+    if verbose:
+        handler.setLevel(logging.DEBUG)
+    elif quiet:
+        handler.setLevel(logging.WARNING)
+    else:
+        handler.setLevel(logging.INFO)
+    root_logger.addHandler(handler)
+    return root_logger
+
+
+def cleanup_ruffus_error_message(msg):
+    msg = re.sub(r'\s+', r' ', msg)
+    msg = re.sub(r"\((.+?)\)", r'\1', msg)
+    msg = msg.strip()
+    return msg
+
+
+def do_ruffus_exception(ruffus_five_tuple, options, log):
+    """Replace the elaborate ruffus stack trace with a user friendly
+    description of the error message that occurred."""
+    exit_code = None
+
+    _task_name, _job_name, exc_name, exc_value, exc_stack = ruffus_five_tuple
+
+    if isinstance(exc_name, type):
+        # ruffus is full of mystery... sometimes (probably when the process
+        # group leader is killed) exc_name is the class object of the exception,
+        # rather than a str. So reach into the object and get its name.
+        exc_name = exc_name.__name__
+
+    if exc_name.startswith('ocrmypdf.exceptions.'):
+        base_exc_name = exc_name.replace('ocrmypdf.exceptions.', '')
+        exc_class = getattr(ocrmypdf_exceptions, base_exc_name)
+        exit_code = getattr(exc_class, 'exit_code', ExitCode.other_error)
+        try:
+            if isinstance(exc_value, exc_class):
+                exc_msg = str(exc_value)
+            else:
+                exc_msg = str(exc_class())
+        except Exception:
+            exc_msg = "Unknown"
+
+    if exc_name in ('builtins.SystemExit', 'SystemExit'):
+        match = re.search(r"\.(.+?)\)", exc_value)
+        exit_code_name = match.groups()[0]
+        exit_code = getattr(ExitCode, exit_code_name, 'other_error')
+    elif exc_name == 'ruffus.ruffus_exceptions.MissingInputFileError':
+        log.error(cleanup_ruffus_error_message(exc_value))
+        exit_code = ExitCode.input_file
+    elif exc_name in ('builtins.KeyboardInterrupt', 'KeyboardInterrupt'):
+        # We have to print in this case because the log daemon might be toast
+        print("Interrupted by user", file=sys.stderr)
+        exit_code = ExitCode.ctrl_c
+    elif exc_name == 'subprocess.CalledProcessError':
+        # It's up to the subprocess handler to report something useful
+        msg = "Error occurred while running this command:"
+        log.error(msg + '\n' + exc_value)
+        exit_code = ExitCode.child_process_error
+    elif exc_name.startswith('ocrmypdf.exceptions.'):
+        if exc_msg:
+            log.error(exc_msg)
+    elif exc_name == 'PIL.Image.DecompressionBombError':
+        msg = cleanup_ruffus_error_message(exc_value)
+        msg += ("\nUse the --max-image-mpixels argument to set increase the "
+                "maximum number of megapixels to accept.")
+        log.error(msg)
+        exit_code = ExitCode.input_file
+
+    if exit_code is not None:
+        return exit_code
+
+    if not options.verbose:
+        log.error(exc_stack)
+    return ExitCode.other_error
+
+
+def traverse_ruffus_exception(exceptions, options, log):
+    """Traverse a RethrownJobError and output the exceptions
+
+    Ruffus presents exceptions as 5 element tuples. The RethrownJobException
+    has a list of exceptions like
+        e.job_exceptions = [(5-tuple), (5-tuple), ...]
+
+    ruffus < 2.7.0 had a bug with exception marshalling that would give
+    different output whether the main or child process raised the exception.
+    We no longer support this.
+
+    Attempting to log the exception itself will re-marshall it to the logger
+    which is normally running in another process. It's better to avoid re-
+    marshalling.
+
+    The exit code will be based on this, even if multiple exceptions occurred
+    at the same time."""
+
+    exit_codes = []
+    for exc in exceptions:
+        exit_code = do_ruffus_exception(exc, options, log)
+        exit_codes.append(exit_code)
+
+    return exit_codes[0]  # Multiple codes are rare so take the first one
+
+
+def check_closed_streams(options):
+    """Work around Python issue with multiprocessing forking on closed streams
+
+    https://bugs.python.org/issue28326
+
+    Attempting to a fork/exec a new Python process when any of std{in,out,err}
+    are closed or not flushable for some reason may raise an exception.
+    Fix this by opening devnull if the handle seems to be closed.  Do this
+    globally to avoid tracking places all places that fork.
+
+    Seems to be specific to multiprocessing.Process not all Python process
+    forkers.
+
+    The error actually occurs when the stream object is not flushable,
+    but replacing an open stream object that is not flushable with
+    /dev/null is a bad idea since it will create a silent failure.  Replacing
+    a closed handle with /dev/null seems safe.
+
+    """
+
+    if sys.version_info[0:3] >= (3, 6, 4):
+        return True  # Issued fixed in Python 3.6.4+
+
+    if sys.stderr is None:
+        sys.stderr = open(os.devnull, 'w')
+
+    if sys.stdin is None:
+        if options.input_file == '-':
+            print("Trying to read from stdin but stdin seems closed",
+                  file=sys.stderr)
+            return False
+        sys.stdin = open(os.devnull, 'r')
+
+    if sys.stdout is None:
+        if options.output_file == '-':
+            # Can't replace stdout if the user is piping
+            # If this case can even happen, it must be some kind of weird
+            # stream.
+            print(textwrap.dedent("""\
+                Output was set to stdout '-' but the stream attached to
+                stdout does not support the flush() system call.  This
+                will fail."""), file=sys.stderr)
+            return False
+        sys.stdout = open(os.devnull, 'w')
+
+    return True
+
+
+def log_page_orientations(pdfinfo, _log):
+    direction = {0: 'n', 90: 'e',
+                180: 's', 270: 'w'}
+    orientations = []
+    for n, page in enumerate(pdfinfo):
+        angle = page.rotation or 0
+        if angle != 0:
+            orientations.append('{0}{1}'.format(
+                n + 1,
+                direction.get(angle, '')))
+    if orientations:
+        _log.info('Page orientations detected: ' + ' '.join(orientations))
+
+
+def preamble(_log):
+    _log.debug('ocrmypdf ' + VERSION)
+    _log.debug('tesseract ' + tesseract.version())
+    _log.debug('qpdf ' + qpdf.version())
+    _log.debug('gs ' + ghostscript.version())
+
+
+def check_environ(options, _log):
+    old_envvars = (
+        'OCRMYPDF_TESSERACT',
+        'OCRMYPDF_QPDF',
+        'OCRMYPDF_GS',
+        'OCRMYPDF_UNPAPER')
+    for k in old_envvars:
+        if k in os.environ:
+            _log.warning(textwrap.dedent("""\
+                OCRmyPDF no longer uses the environment variable {}.
+                Change PATH to select alternate programs.""".format(k)))
+
+
+def check_input_file(options, _log, start_input_file):
+    if options.input_file == '-':
+        # stdin
+        _log.info('reading file from standard input')
+        with open(start_input_file, 'wb') as stream_buffer:
+            from shutil import copyfileobj
+            copyfileobj(sys.stdin.buffer, stream_buffer)
+    else:
+        try:
+            re_symlink(options.input_file, start_input_file, _log)
+        except FileNotFoundError:
+            _log.error("File not found - " + options.input_file)
+            raise InputFileError()
+
+
+def check_requested_output_file(options, _log):
+    if options.output_file == '-':
+        if sys.stdout.isatty():
+            _log.error(textwrap.dedent("""\
+                Output was set to stdout '-' but it looks like stdout
+                is connected to a terminal.  Please redirect stdout to a
+                file."""))
+            raise BadArgsError()
+    elif not is_file_writable(options.output_file):
+        _log.error(
+            "Output file location (" + options.output_file + ") " +
+            "is not a writable file.")
+        raise OutputFileAccessError()
+
+
+def report_output_file_size(options, _log, input_file, output_file):
+    try:
+        output_size = Path(output_file).stat().st_size
+        input_size = Path(input_file).stat().st_size
+    except FileNotFoundError:
+        return  # Outputting to stream or something
+    ratio = output_size / input_size
+    if ratio < 1.35 or input_size < 25000:
+        return  # Seems fine
+
+    reasons = []
+    image_preproc = {
+        'deskew',
+        'clean_final',
+        'remove_background',
+        'oversample',
+        'force_ocr'
+    }
+    for arg in image_preproc:
+        attr = getattr(options, arg, None)
+        if not attr:
+            continue
+        reasons.append(
+                "The argument --{} was issued, causing transcoding.".format(
+                        arg.replace('_', '-')))
+
+    if reasons:
+        explanation = (
+            "Possible reasons for this include:\n" + '\n'.join(reasons) + "\n")
+    else:
+        explanation = (
+            "No reason for this increase is known.  Please report this issue.")
+
+    _log.warning(textwrap.dedent("""\
+        The output file size is {:.2f}× larger than the input file.
+        {}
+        """.format(ratio, explanation)))
+
+
+def run_pipeline(args=None):
+    options = parser.parse_args(args=args)
+    options.verbose_abbreviated_path = 1
+    if os.environ.get('_OCRMYPDF_THREADS'):
+        options.use_threads = True
+
+    if not check_closed_streams(options):
+        return ExitCode.bad_args
+
+    logger_args = {'verbose': options.verbose, 'quiet': options.quiet}
+
+    _log, _log_mutex = proxy_logger.make_shared_logger_and_proxy(
+        logging_factory, __name__, logger_args)
+    preamble(_log)
+    check_options(options, _log)
+
+    # Complain about qpdf version < 7.0.0
+    # Suppress the warning if in the test suite, since there are no PPAs
+    # for qpdf 7.0.0 for Ubuntu trusty (i.e. Travis)
+    if qpdf.version() < '7.0.0' and not os.environ.get('PYTEST_CURRENT_TEST'):
+        complain(
+            "You are using qpdf version {0} which has known issues including "
+            "security vulnerabilities with certain malformed PDFs. Consider "
+            "upgrading to version 7.0.0 or newer.".format(qpdf.version()))
+
+    if ghostscript.version() == '9.24':
+        complain(
+            "Ghostscript 9.24 contains serious regressions and is not "
+            "supported. Please upgrade to Ghostscript 9.25 or use an older "
+            "version."
+        )
+        return ExitCode.missing_dependency
+
+    # Any changes to options will not take effect for options that are already
+    # bound to function parameters in the pipeline. (For example
+    # options.input_file, options.pdf_renderer are already bound.)
+    if not options.jobs:
+        options.jobs = available_cpu_count()
+
+    # Performance is improved by setting Tesseract to single threaded. In tests
+    # this gives better throughput than letting a smaller number of Tesseract
+    # jobs run multithreaded. Same story for pngquant. Tess <4 ignores this
+    # variable, but harmless to set if ignored.
+    os.environ.setdefault('OMP_THREAD_LIMIT', '1')
+
+    check_environ(options, _log)
+    if os.environ.get('PYTEST_CURRENT_TEST'):
+        os.environ['_OCRMYPDF_TEST_INFILE'] = options.input_file
+
+    try:
+        work_folder = mkdtemp(prefix="com.github.ocrmypdf.")
+        options.history_file = os.path.join(
+            work_folder, 'ruffus_history.sqlite')
+        start_input_file = os.path.join(
+            work_folder, 'origin')
+
+        check_input_file(options, _log, start_input_file)
+        check_requested_output_file(options, _log)
+
+        manager = JobContextManager()
+        manager.register('JobContext', JobContext)  # pylint: disable=no-member
+        manager.start()
+
+        context = manager.JobContext()  # pylint: disable=no-member
+        context.set_options(options)
+        context.set_work_folder(work_folder)
+
+        build_pipeline(options, work_folder, _log, context)
+        atexit.register(cleanup_working_files, work_folder, options)
+        cmdline.run(options)
+    except ruffus_exceptions.RethrownJobError as e:
+        if options.verbose:
+            _log.debug(str(e))  # stringify exception so logger doesn't have to
+        exceptions = e.job_exceptions
+        exitcode = traverse_ruffus_exception(exceptions, options, _log)
+        if exitcode is None:
+            _log.error("Unexpected ruffus exception: " + str(e))
+            _log.error(repr(e))
+            return ExitCode.other_error
+        return exitcode
+    except ExitCodeException as e:
+        return e.exit_code
+    except Exception as e:
+        _log.error(str(e))
+        return ExitCode.other_error
+
+    if options.flowchart:
+        _log.info("Flowchart saved to {}".format(options.flowchart))
+        return ExitCode.ok
+    elif options.output_file == '-':
+        _log.info("Output sent to stdout")
+    elif os.path.samefile(options.output_file, os.devnull):
+        pass  # Say nothing when sending to dev null
+    else:
+        if options.output_type.startswith('pdfa'):
+            pdfa_info = file_claims_pdfa(options.output_file)
+            if pdfa_info['pass']:
+                msg = 'Output file is a {} (as expected)'
+                _log.info(msg.format(pdfa_info['conformance']))
+            else:
+                msg = 'Output file is okay but is not PDF/A (seems to be {})'
+                _log.warning(msg.format(pdfa_info['conformance']))
+                return ExitCode.pdfa_conversion_failed
+        if not qpdf.check(options.output_file, _log):
+            _log.warning('Output file: The generated PDF is INVALID')
+            return ExitCode.invalid_output_pdf
+
+        report_output_file_size(options, _log, start_input_file,
+                                options.output_file)
+
+    pdfinfo = context.get_pdfinfo()
+    if options.verbose:
+        from pprint import pformat
+        _log.debug(pformat(pdfinfo))
+
+    log_page_orientations(pdfinfo, _log)
+
+    return ExitCode.ok
+
+
+if __name__ == '__main__':
+    sys.exit(run_pipeline())

src/ocrmypdf/_jobcontext.py

@@ -0,0 +1,84 @@
+# © 2018 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from contextlib import suppress
+from multiprocessing.managers import SyncManager
+import sys
+import shutil
+
+from .pdfinfo import PdfInfo
+
+
+class JobContext:
+    """Holds our context for a particular run of the pipeline
+
+    A multiprocessing manager effectively creates a separate process
+    that keeps the master job context object.  Other threads access
+    job context via multiprocessing proxy objects.
+
+    While this would naturally lend itself @property's it seems to make
+    a little more sense to use functions to make it explicitly that the
+    invocation requires marshalling data across a process boundary.
+
+    """
+
+    def __init__(self):
+        self.pdfinfo = None
+        self.options = None
+        self.work_folder = None
+        self.rotations = {}
+
+    def generate_pdfinfo(self, infile):
+        self.pdfinfo = PdfInfo(infile)
+
+    def get_pdfinfo(self):
+        "What we know about the input PDF"
+        return self.pdfinfo
+
+    def set_pdfinfo(self, pdfinfo):
+        self.pdfinfo = pdfinfo
+
+    def get_options(self):
+        return self.options
+
+    def set_options(self, options):
+        self.options = options
+
+    def get_work_folder(self):
+        return self.work_folder
+
+    def set_work_folder(self, work_folder):
+        self.work_folder = work_folder
+
+    def get_rotation(self, pageno):
+        return self.rotations.get(pageno, 0)
+
+    def set_rotation(self, pageno, value):
+        self.rotations[pageno] = value
+
+
+class JobContextManager(SyncManager):
+    pass
+
+
+def cleanup_working_files(work_folder, options):
+    if options.keep_temporary_files:
+        print("Temporary working files saved at:\n{0}".format(work_folder),
+              file=sys.stderr)
+    else:
+        with suppress(FileNotFoundError):
+            shutil.rmtree(work_folder)

src/ocrmypdf/_unicodefun.py

@@ -0,0 +1,113 @@
+# Copyright (c) 2014, Armin Ronacher
+#
+# Copyright (c) 2017, James R Barlow
+#
+# Some rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#
+#     * Redistributions in binary form must reproduce the above
+#       copyright notice, this list of conditions and the following
+#       disclaimer in the documentation and/or other materials provided
+#       with the distribution.
+#
+#     * The names of the contributors may not be used to endorse or
+#       promote products derived from this software without specific
+#       prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+import os
+import sys
+import codecs
+
+
+def verify_python3_env():
+    """Ensures that the environment is good for unicode on Python 3."""
+
+    # PEP 538 changes in Python 3.7 should make this wrangling unnecessary
+    if sys.version_info[0:3] >= (3, 7, 0):
+        return
+
+    try:
+        import locale
+        fs_enc = codecs.lookup(locale.getpreferredencoding()).name
+    except Exception:
+        fs_enc = 'ascii'
+    if fs_enc != 'ascii':
+        return
+
+    extra = ''
+    if os.name == 'posix':
+        import subprocess
+        rv = subprocess.Popen(['locale', '-a'], stdout=subprocess.PIPE,
+                              stderr=subprocess.PIPE).communicate()[0]
+        good_locales = set()
+        has_c_utf8 = False
+
+        # Make sure we're operating on text here.
+        if isinstance(rv, bytes):
+            rv = rv.decode('ascii', 'replace')
+
+        for line in rv.splitlines():
+            locale = line.strip()
+            if locale.lower().endswith(('.utf-8', '.utf8')):
+                good_locales.add(locale)
+                if locale.lower() in ('c.utf8', 'c.utf-8'):
+                    has_c_utf8 = True
+
+        extra += '\n\n'
+        if not good_locales:
+            extra += (
+                'Additional information: on this system no suitable UTF-8\n'
+                'locales were discovered.  This most likely requires resolving\n'
+                'by reconfiguring the locale system.'
+            )
+        elif has_c_utf8:
+            extra += (
+                'This system supports the C.UTF-8 locale which is recommended.\n'
+                'You might be able to resolve your issue by exporting the\n'
+                'following environment variables:\n\n'
+                '    export LC_ALL=C.UTF-8\n'
+                '    export LANG=C.UTF-8'
+            )
+        else:
+            extra += (
+                'This system lists a couple of UTF-8 supporting locales that\n'
+                'you can pick from.  The following suitable locales were\n'
+                'discovered: %s'
+            ) % ', '.join(sorted(good_locales))
+
+        bad_locale = None
+        for locale in os.environ.get('LC_ALL'), os.environ.get('LANG'):
+            if locale and locale.lower().endswith(('.utf-8', '.utf8')):
+                bad_locale = locale
+            if locale is not None:
+                break
+        if bad_locale is not None:
+            extra += (
+                '\nocrmypdf discovered that you exported a UTF-8 locale\n'
+                'but the locale system could not pick up from it because\n'
+                'it does not exist.  The exported locale is "%s" but it\n'
+                'is not supported'
+            ) % bad_locale
+
+    raise RuntimeError('ocrmypdf will abort further execution because Python 3 '
+                       'was configured to use ASCII as encoding for the '
+                       'environment.' + extra)

src/ocrmypdf/_weave.py

@@ -0,0 +1,368 @@
+# © 2018 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from pathlib import Path
+from itertools import groupby
+
+import pikepdf
+
+from .helpers import flatten_groups, page_number
+from .exec import tesseract
+
+
+def _update_page_resources(*, page, font, font_key, procset):
+    "Update this page's fonts with a reference to the Glyphless font"
+
+    if '/Resources' not in page:
+        page['/Resources'] = pikepdf.Dictionary({})
+    resources = page['/Resources']
+    try:
+        fonts = resources['/Font']
+    except KeyError:
+        fonts = pikepdf.Dictionary({})
+    if font_key not in fonts:
+        fonts[font_key] = font
+    resources['/Font'] = fonts
+
+    # Reassign /ProcSet to one that just lists everything - ProcSet is
+    # obsolete and doesn't matter but recommended for old viewer support
+    resources['/ProcSet'] = procset
+
+
+def _weave_layers_graft(
+        *, pdf_base, page_num, text, font, font_key, procset, rotation, log):
+    """Insert the text layer from text page 0 on to pdf_base at page_num"""
+
+    log.debug("Grafting")
+    if Path(text).stat().st_size == 0:
+        return
+
+    # This is a pointer indicating a specific page in the base file
+    pdf_text = pikepdf.open(text)
+    pdf_text_contents = pdf_text.pages[0].Contents.read_bytes()
+
+    if not tesseract.has_textonly_pdf():
+        # If we don't have textonly_pdf, edit the stream to delete the
+        # instruction to draw the image Tesseract generated, which we do not
+        # use.
+        stream = bytearray(pdf_text_contents)
+        pattern = b'/Im1 Do'
+        idx = stream.find(pattern)
+        stream[idx:(idx + len(pattern))] = b' ' * len(pattern)
+        pdf_text_contents = bytes(stream)
+
+    base_page = pdf_base.pages.p(page_num)
+
+    # The text page always will be oriented up by this stage but the original
+    # content may have a rotation applied. Wrap the text stream with a rotation
+    # so it will be oriented the same way as the rest of the page content.
+    # (Previous versions OCRmyPDF rotated the content layer to match the text.)
+    mediabox = [float(pdf_text.pages[0].MediaBox[v])
+                for v in range(4)]
+    wt, ht = mediabox[2] - mediabox[0], mediabox[3] - mediabox[1]
+
+    mediabox = [float(base_page.MediaBox[v])
+                for v in range(4)]
+    wp, hp = mediabox[2] - mediabox[0], mediabox[3] - mediabox[1]
+
+    translate = pikepdf.PdfMatrix().translated(-wt / 2, -ht / 2)
+    untranslate = pikepdf.PdfMatrix().translated(wp / 2, hp / 2)
+    # -rotation because the input is a clockwise angle and this formula
+    # uses CCW
+    rotation = -rotation % 360
+    rotate = pikepdf.PdfMatrix().rotated(rotation)
+
+    # Because of rounding of DPI, we might get a text layer that is not
+    # identically sized to the target page. Scale to adjust. Normally this
+    # is within 0.998.
+    if rotation in (90, 270):
+        wt, ht = ht, wt
+    scale_x = wp / wt
+    scale_y = hp / ht
+
+    log.debug('%r', (scale_x, scale_y))
+    scale = pikepdf.PdfMatrix().scaled(scale_x, scale_y)
+
+    # Translate the text so it is centered at (0, 0), rotate it there, adjust
+    # for a size different between initial and text PDF, then untranslate
+    ctm = translate @ rotate @ scale @ untranslate
+
+    pdf_text_contents = (
+        b'q %s cm\n' % ctm.encode() +
+        pdf_text_contents +
+        b'\nQ\n'
+    )
+
+    new_text_layer = pikepdf.Stream(pdf_base, pdf_text_contents)
+
+    base_page.page_contents_add(new_text_layer, prepend=True)
+
+    _update_page_resources(
+        page=base_page, font=font, font_key=font_key, procset=procset
+    )
+
+
+def _find_font(text, pdf_base):
+    "Copy a font from the filename text into pdf_base"
+
+    font, font_key = None, None
+    possible_font_names = ('/f-0-0', '/F1')
+    try:
+        pdf_text = pikepdf.open(text)
+        pdf_text_fonts = pdf_text.pages[0].Resources.get('/Font', {})
+    except Exception:
+        return None, None
+
+    for f in possible_font_names:
+        pdf_text_font = pdf_text_fonts.get(f, None)
+        if pdf_text_font is not None:
+            font_key = f
+            break
+    if pdf_text_font:
+        font = pdf_base.copy_foreign(pdf_text_font)
+    return font, font_key
+
+
+def _traverse_toc(pdf_base, visitor_fn, log):
+    """
+    Walk the table of contents, calling visitor_fn() at each node
+
+    The /Outlines data structure is a messy data structure, but rather than
+    navigating hierarchically we just track unique nodes.  Enqueue nodes when
+    we find them, and never visit them again.  set() is awesome.  We look for
+    the two types of object in the table of contents that can be page bookmarks
+    and update the page entry.
+
+    """
+
+    visited = set()
+    queue = set()
+    link_keys = ('/Parent', '/First', '/Last', '/Prev', '/Next')
+
+    if not '/Outlines' in pdf_base.root:
+        return
+
+    queue.add(pdf_base.root.Outlines.objgen)
+    while queue:
+        objgen = queue.pop()
+        visited.add(objgen)
+        node = pdf_base.get_object(objgen)
+        log.debug('fix toc: exploring outline entries at %r', objgen)
+
+        # Enumerate other nodes we could visit from here
+        for key in link_keys:
+            if key not in node:
+                continue
+            item = node[key]
+            if not item.is_indirect:
+                # Direct references are not allowed here, but it's not clear
+                # what we should do if we find any. Removing them is an option:
+                # node[key] = pdf_base.make_indirect(None)
+                continue
+            objgen = item.objgen
+            if objgen not in visited:
+                queue.add(objgen)
+
+        if visitor_fn:
+            visitor_fn(pdf_base, node, log)
+
+
+def _fix_toc(pdf_base, pageref_remap, log):
+    """Repair the table of contents
+
+    Whenever we replace a page wholesale, it gets assigned a new objgen number
+    and other references to it within the PDF become invalid, most notably in
+    the table of contents (/Outlines in PDF-speak).  In weave_layers we collect
+    pageref_remap, a mapping that describes the new objgen number given an old
+    one.  (objgen is a tuple, and the gen is almost always zero.)
+
+    It may ultimately be better to find a way to rebuild a page in place.
+
+    """
+
+    if not pageref_remap:
+        return
+
+    def remap_dest(dest_node):
+        """
+        Inner helper function: change the objgen for any page from the old we
+        invalidated to its new one.
+        """
+        if not isinstance(dest_node, pikepdf.Array):
+            return
+        pageref = dest_node[0]
+        if pageref['/Type'] == '/Page' and \
+                pageref.objgen in pageref_remap:
+            new_objgen = pageref_remap[pageref.objgen]
+            dest_node[0] = pdf_base.get_object(new_objgen)
+
+    def visit_remap_dest(pdf_base, node, log):
+        """
+        Visitor function to fix ToC entries
+
+        Test for the two types of references to pages that can occur in ToCs.
+        Both types have the same final format (an indirect reference to the
+        target page).
+        """
+        if '/Dest' in node:
+            # /Dest reference to another page (old method)
+            remap_dest(node['/Dest'])
+        elif '/A' in node:
+            # /A (action) command set to "GoTo" (newer method)
+            if '/S' in node['/A'] and node['/A']['/S'] == '/GoTo':
+                remap_dest(node['/A']['/D'])
+
+    _traverse_toc(pdf_base, visit_remap_dest, log)
+
+
+def weave_layers(
+        infiles,
+        output_file,
+        log,
+        context):
+    """Apply text layer and/or image layer changes to baseline file
+
+    This is where the magic happens. infiles will be the main PDF to modify,
+    and optional .text.pdf and .image-layer.pdf files, organized however ruffus
+    organizes them.
+
+    From .text.pdf, we copy the content stream (which contains the Tesseract
+    OCR results), and rotate it into place. The first time we do this, we also
+    copy the GlyphlessFont, and then reference that font again.
+
+    For .image-layer.pdf, we check if this is a "pointer" to the original file,
+    or a new file. If a new file, we replace the page and remember that we
+    replaced this page.
+
+    Every 100 open files, we save intermediate results, to avoid any resource
+    limits, since pikepdf/qpdf need to keep a lot of open file handles in the
+    background. When objects are copied from one file to another qpdf, qpdf
+    doesn't actually copy the data until asked to write, so all the resources
+    it may need to remain available.
+
+    For completeness, we set up a /ProcSet on every page, although it's
+    unlikely any PDF viewer cares about this anymore.
+
+    """
+
+    def input_sorter(key):
+        try:
+            return page_number(key)
+        except ValueError:
+            return -1
+    flat_inputs = sorted(flatten_groups(infiles), key=input_sorter)
+    groups = groupby(flat_inputs, key=input_sorter)
+
+    # Extract first item
+    _, basegroup = next(groups)
+    base = list(basegroup)[0]
+    path_base = Path(base).resolve()
+    pdf_base = pikepdf.open(path_base)
+    keep_open = []
+    font, font_key, procset = None, None, None
+    pdfinfo = context.get_pdfinfo()
+    pagerefs = {}
+
+    # Walk the table of contents first, to trigger pikepdf/qpdf to resolve all
+    # page references in the table of contents. Some PDF generators put invalid
+    # references in the ToC, so we want to resolve them to null before we
+    # create any references, or the ToC will be corrupted
+    _traverse_toc(pdf_base, None, log)
+
+    procset = pdf_base.make_indirect(
+        pikepdf.Object.parse(b'[ /PDF /Text /ImageB /ImageC /ImageI ]'))
+
+    # Iterate rest
+    for page_num, layers in groups:
+        layers = list(layers)
+        log.debug(page_num)
+        log.debug(layers)
+
+        text = next(
+            (ii for ii in layers if ii.endswith('.text.pdf')), None
+        )
+        image = next(
+            (ii for ii in layers if ii.endswith('.image-layer.pdf')), None
+        )
+
+        if text and not font:
+            font, font_key = _find_font(text, pdf_base)
+
+        replacing = False
+        content_rotation = pdfinfo[page_num - 1].rotation
+
+        path_image = Path(image).resolve() if image else None
+        if path_image is not None and path_image != path_base:
+            # We are replacing the old page with a rasterized PDF of the new
+            # page
+            log.debug("Replace")
+            old_objgen = pdf_base.pages[page_num - 1].objgen
+
+            pdf_image = pikepdf.open(image)
+            keep_open.append(pdf_image)
+            image_page = pdf_image.pages[0]
+            pdf_base.pages[page_num - 1] = image_page
+
+            # We're adding a new page, which will get a new objgen number pair,
+            # so we need to update any references to it.  qpdf did not like
+            # my attempt to update the old object in place, but that is an
+            # option to consider
+            pagerefs[old_objgen] = pdf_base.pages[page_num - 1].objgen
+            replacing = True
+
+        autorotate_correction = context.get_rotation(page_num - 1)
+        if replacing:
+            content_rotation = autorotate_correction
+        text_rotation = autorotate_correction
+        text_misaligned = (text_rotation - content_rotation) % 360
+        log.debug('%r', [
+            text_rotation, autorotate_correction, text_misaligned,
+            content_rotation]
+        )
+
+        if text and font:
+            # Graft the text layer onto this page, whether new or old
+            _weave_layers_graft(
+                pdf_base=pdf_base, page_num=page_num, text=text, font=font,
+                font_key=font_key, rotation=text_misaligned, procset=procset,
+                log=log
+            )
+
+        # Correct the rotation if applicable
+        pdf_base.pages[page_num - 1].Rotate = \
+            (content_rotation - autorotate_correction) % 360
+
+        if len(keep_open) > 100:
+            # qpdf limitations require us to keep files open when we intend
+            # to copy content from them before saving. However, we want to keep
+            # a lid on file handles and memory usage, so for big files we're
+            # going to stop and save periodically. Attach the font to page 1
+            # even if page 1 doesn't use it, so we have a way to get it back.
+            page0 = pdf_base.pages[0]
+            _update_page_resources(
+                page=page0, font=font, font_key=font_key, procset=procset)
+            interim = output_file + '_working{}.pdf'.format(page_num)
+            pdf_base.save(interim)
+            del pdf_base
+            keep_open = []
+
+            pdf_base = pikepdf.open(interim)
+            procset = pdf_base.pages[0].Resources.ProcSet
+            font = pdf_base.pages[0].Resources.Font.get(font_key)
+
+    _fix_toc(pdf_base, pagerefs, log)
+    pdf_base.save(output_file)

src/ocrmypdf/exceptions.py

@@ -0,0 +1,109 @@
+# © 2016 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+
+from enum import IntEnum
+from textwrap import dedent
+
+class ExitCode(IntEnum):
+    ok = 0
+    bad_args = 1
+    input_file = 2
+    missing_dependency = 3
+    invalid_output_pdf = 4
+    file_access_error = 5
+    already_done_ocr = 6
+    child_process_error = 7
+    encrypted_pdf = 8
+    invalid_config = 9
+    pdfa_conversion_failed = 10
+    other_error = 15
+    ctrl_c = 130
+
+
+class ExitCodeException(Exception):
+    exit_code = ExitCode.other_error
+    message = ""
+
+    def __str__(self):
+        super_msg = super().__str__()  # Don't do str(super())
+        if self.message:
+            return self.message.format(super_msg)
+        return super_msg
+
+
+class BadArgsError(ExitCodeException):
+    exit_code = ExitCode.bad_args
+
+
+class PdfMergeFailedError(ExitCodeException):
+    exit_code = ExitCode.input_file
+    message = dedent('''\
+        Failed to merge PDF image layer with OCR layer
+
+        Usually this happens because the input PDF file is malformed and
+        ocrmypdf cannot automatically correct the problem on its own.
+
+        Try using
+            ocrmypdf --pdf-renderer sandwich  [..other args..]
+        ''')
+
+class MissingDependencyError(ExitCodeException):
+    exit_code = ExitCode.missing_dependency
+
+
+class UnsupportedImageFormatError(ExitCodeException):
+    exit_code = ExitCode.input_file
+
+
+class DpiError(ExitCodeException):
+    exit_code = ExitCode.input_file
+
+
+class OutputFileAccessError(ExitCodeException):
+    exit_code = ExitCode.file_access_error
+
+
+class PriorOcrFoundError(ExitCodeException):
+    exit_code = ExitCode.already_done_ocr
+
+
+class InputFileError(ExitCodeException):
+    exit_code = ExitCode.input_file
+
+
+class SubprocessOutputError(ExitCodeException):
+    exit_code = ExitCode.child_process_error
+
+
+class EncryptedPdfError(ExitCodeException):
+    exit_code = ExitCode.encrypted_pdf
+    message = dedent('''\
+        Input PDF is encrypted. The encryption must be removed to
+        perform OCR.
+
+        For information about this PDF's security use
+            qpdf --show-encryption infilename
+
+        You can remove the encryption using
+            qpdf --decrypt [--password=[password]] infilename
+        ''')
+
+
+class TesseractConfigError(ExitCodeException):
+    exit_code = ExitCode.invalid_config
+    message = "Error occurred while parsing a Tesseract configuration file"

src/ocrmypdf/exec/__init__.py

@@ -0,0 +1,59 @@
+# © 2016 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Wrappers to manage subprocess calls"""
+
+import os
+import re
+import sys
+from subprocess import run, STDOUT, PIPE, CalledProcessError
+from ..exceptions import MissingDependencyError
+
+
+def get_version(program, *,
+        version_arg='--version', regex=r'(\d+(\.\d+)*)'):
+    "Get the version of the specified program"
+    args_prog = [
+        program,
+        version_arg
+    ]
+    try:
+        proc = run(
+            args_prog, close_fds=True, universal_newlines=True,
+            stdout=PIPE, stderr=STDOUT, check=True)
+        output = proc.stdout
+    except FileNotFoundError as e:
+        raise MissingDependencyError(
+            "Could not find program '{}' on the PATH".format(
+                program)) from e
+    except CalledProcessError as e:
+        if e.returncode < 0:
+            raise MissingDependencyError(
+                "Ran program '{}' but it exited with an error:\n{}".format(
+                    program, e.output)) from e
+        raise MissingDependencyError(
+            "Could not find program '{}' on the PATH".format(
+                program)) from e
+    try:
+        version = re.match(regex, output.strip()).group(1)
+    except AttributeError as e:
+        raise MissingDependencyError(
+            ("The program '{}' did not report its version. "
+            "Message was:\n{}").format(program, output)
+        )
+
+    return version

src/ocrmypdf/exec/ghostscript.py

@@ -0,0 +1,280 @@
+# © 2017 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from tempfile import NamedTemporaryFile
+from subprocess import run, PIPE, STDOUT
+from shutil import copy
+from functools import lru_cache
+import re
+from PIL import Image
+from . import get_version
+from ..exceptions import SubprocessOutputError
+from ..helpers import fspath
+
+
+@lru_cache(maxsize=1)
+def version():
+    return get_version('gs')
+
+
+def jpeg_passthrough_available():
+    """Returns True if the installed version of Ghostscript supports JPEG passthru
+
+    Prior to 9.23, Ghostscript decode and re-encoded JPEGs internally. In 9.23
+    it gained the ability to keep JPEGs unmodified. However, the 9.23
+    implementation was buggy and would deletes the last two bytes of images in
+    some cases, as reported here.
+    https://bugs.ghostscript.com/show_bug.cgi?id=699216
+
+    The issue was fixed for 9.24, hence that is the first version we consider
+    the feature available. (However, we don't use 9.24 at all, so the first
+    version that allows JPEG passthrough is 9.25.
+
+    """
+    return version() >= '9.24'
+
+
+def _gs_error_reported(stream):
+    return re.search(r'error', stream, flags=re.IGNORECASE)
+
+
+def extract_text(input_file, pageno=1):
+    """Use the txtwrite device to get text layout information out
+
+    For details on options of -dTextFormat see
+    https://www.ghostscript.com/doc/current/VectorDevices.htm#TXT
+
+    Format is like
+    <page>
+    <line>
+    <span bbox="left top right bottom" font="..." size="...">
+    <char bbox="...." c="X"/>
+
+    :param pageno: number of page to extract, or all pages if None
+    :return: XML-ish text representation in bytes
+    """
+
+    if pageno is not None:
+        pages = [
+            '-dFirstPage=%i' % pageno,
+            '-dLastPage=%i' % pageno
+        ]
+    else:
+        pages = []
+
+    args_gs = [
+        'gs',
+        '-dQUIET',
+        '-dSAFER',
+        '-dBATCH',
+        '-dNOPAUSE',
+        '-sDEVICE=txtwrite',
+        '-dTextFormat=0',
+    ] + pages + [
+        '-o', '-',
+        fspath(input_file)
+    ]
+
+    p = run(args_gs, stdout=PIPE, stderr=PIPE)
+    if p.returncode != 0:
+        raise SubprocessOutputError(
+            'Ghostscript text extraction failed\n%s\n%s\n%s' % (
+                input_file, p.stdout.decode(), p.stderr.decode()
+            )
+        )
+
+    return p.stdout
+
+
+def rasterize_pdf(input_file, output_file, xres, yres, raster_device, log,
+                  pageno=1, page_dpi=None, rotation=None):
+    """Rasterize one page of a PDF at resolution (xres, yres) in canvas units.
+
+    The image is sized to match the integer pixels dimensions implied by
+    (xres, yres) even if those numbers are noninteger. The image's DPI will
+     be overridden with the values in page_dpi.
+
+    :param input_file: pathlike
+    :param output_file: pathlike
+    :param xres: resolution at which to rasterize page
+    :param yres:
+    :param raster_device:
+    :param log:
+    :param pageno: page number to rasterize (beginning at page 1)
+    :param page_dpi: resolution tuple (x, y) overriding output image DPI
+    :return:
+    """
+    res = xres, yres
+    int_res = round(xres), round(yres)
+    if not page_dpi:
+        page_dpi = res
+
+    with NamedTemporaryFile(delete=True) as tmp:
+        args_gs = [
+            'gs',
+            '-dQUIET',
+            '-dSAFER',
+            '-dBATCH',
+            '-dNOPAUSE',
+            '-sDEVICE=%s' % raster_device,
+            '-dFirstPage=%i' % pageno,
+            '-dLastPage=%i' % pageno,
+            '-r{0}x{1}'.format(str(int_res[0]), str(int_res[1])),
+            '-o', tmp.name,
+            '-dAutoRotatePages=/None',  # Probably has no effect on raster
+            '-f',
+            fspath(input_file)
+        ]
+
+        log.debug(args_gs)
+        p = run(args_gs, stdout=PIPE, stderr=STDOUT,
+                universal_newlines=True)
+        if _gs_error_reported(p.stdout):
+            log.error(p.stdout)
+        else:
+            log.debug(p.stdout)
+
+        if p.returncode != 0:
+            log.error('Ghostscript rasterizing failed')
+            raise SubprocessOutputError()
+
+        # Ghostscript only accepts integers for output resolution
+        # if the resolution happens to be fractional, then the discrepancy
+        # would change the size of the output page, especially if the DPI
+        # is quite low. Resize the image to the expected size
+
+        tmp.seek(0)
+        with Image.open(tmp) as im:
+            expected_size = round(im.size[0] / int_res[0] * res[0]), \
+                            round(im.size[1] / int_res[1] * res[1])
+            if expected_size != im.size or page_dpi != (xres, yres):
+                log.debug(
+                    "Ghostscript: resize output image {} -> {}".format(
+                        im.size, expected_size))
+                im = im.resize(expected_size)
+
+            if rotation is not None:
+                log.debug("Rotating output by %i", rotation)
+                # rotation is a clockwise angle and Image.ROTATE_* is
+                # counterclockwise so this cancels out the rotation
+                if rotation == 90:
+                    im = im.transpose(Image.ROTATE_90)
+                elif rotation == 180:
+                    im = im.transpose(Image.ROTATE_180)
+                elif rotation == 270:
+                    im = im.transpose(Image.ROTATE_270)
+                if rotation % 180 == 90:
+                    page_dpi = page_dpi[1], page_dpi[0]
+            im.save(fspath(output_file), dpi=page_dpi)
+
+
+def generate_pdfa(pdf_pages, output_file, compression, log,
+                  threads=1, pdf_version='1.5', pdfa_part='2'):
+    """Generate a PDF/A.
+
+    The pdf_pages, a list files, will be merged into output_file. One or more
+    PDF files may be merged. One of the files in this list must be a pdfmark
+    file that provides Ghostscript with details on how to perform the PDF/A
+    conversion. By default with we pick PDF/A-2b, but this works for 1 or 3.
+
+    compression can be 'jpeg', 'lossless', or an empty string. In 'jpeg',
+    Ghostscript is instructed to convert color and grayscale images to DCT
+    (JPEG encoding). In 'lossless' Ghostscript is told to convert images to
+    Flate (lossless/PNG). If the parameter is omitted Ghostscript is left to
+    make its own decisions about how to encode images; it appears to use a
+    heuristic to decide how to encode images. As of Ghostscript 9.25, we
+    support passthrough JPEG which allows Ghostscript to avoid transcoding
+    images entirely. (The feature was added in 9.23 but broken, and the 9.24
+    release of Ghostscript had regressions, so we don't support it until 9.25.)
+    """
+    compression_args = []
+    if compression == 'jpeg':
+        compression_args = [
+            "-dAutoFilterColorImages=false",
+            "-dColorImageFilter=/DCTEncode",
+            "-dAutoFilterGrayImages=false",
+            "-dGrayImageFilter=/DCTEncode",
+        ]
+    elif compression == 'lossless':
+        compression_args = [
+            "-dAutoFilterColorImages=false",
+            "-dColorImageFilter=/FlateEncode",
+            "-dAutoFilterGrayImages=false",
+            "-dGrayImageFilter=/FlateEncode",
+        ]
+    else:
+        compression_args = [
+            "-dAutoFilterColorImages=true",
+            "-dAutoFilterGrayImages=true",
+        ]
+
+    # Older versions of Ghostscript expect a leading slash in
+    # sColorConversionStrategy, newer ones should not have it. See Ghostscript
+    # git commit fe1c025d.
+    strategy = 'RGB' if version() >= '9.19' else '/RGB'
+
+    if version() == '9.23':
+        # 9.23: new feature JPEG passthrough is broken in some cases, best to
+        # disable it always
+        # https://bugs.ghostscript.com/show_bug.cgi?id=699216
+        compression_args.append('-dPassThroughJPEGImages=false')
+
+    with NamedTemporaryFile(delete=True) as gs_pdf:
+        # nb no need to specify ProcessColorModel when ColorConversionStrategy
+        # is set; see:
+        # https://bugs.ghostscript.com/show_bug.cgi?id=699392
+        args_gs = [
+            "gs",
+            "-dQUIET",
+            "-dBATCH",
+            "-dNOPAUSE",
+            "-dCompatibilityLevel=" + str(pdf_version),
+            "-dNumRenderingThreads=" + str(threads),
+            "-sDEVICE=pdfwrite",
+            "-dAutoRotatePages=/None",
+            "-sColorConversionStrategy=" + strategy
+        ] + compression_args + [
+            "-dJPEGQ=95",
+            "-dPDFA=" + pdfa_part,
+            "-dPDFACompatibilityPolicy=1",
+            "-sOutputFile=" + gs_pdf.name,
+        ]
+        args_gs.extend(fspath(s) for s in pdf_pages)  # Stringify Path objs
+        log.debug(args_gs)
+        p = run(args_gs, stdout=PIPE, stderr=STDOUT,
+                universal_newlines=True)
+
+        if _gs_error_reported(p.stdout):
+            log.error(p.stdout)
+        elif 'overprint mode not set' in p.stdout:
+            # Unless someone is going to print PDF/A documents on a
+            # magical sRGB printer I can't see the removal of overprinting
+            # being a problem....
+            log.debug(
+                "Ghostscript had to remove PDF 'overprinting' from the "
+                "input file to complete PDF/A conversion. "
+                )
+        else:
+            log.debug(p.stdout)
+
+        if p.returncode == 0:
+            # Ghostscript does not change return code when it fails to create
+            # PDF/A - check PDF/A status elsewhere
+            copy(gs_pdf.name, fspath(output_file))
+        else:
+            log.error('Ghostscript PDF/A rendering failed')
+            raise SubprocessOutputError()

src/ocrmypdf/exec/jbig2enc.py

@@ -0,0 +1,66 @@
+# © 2018 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from subprocess import CalledProcessError, run, PIPE
+from functools import lru_cache
+import sys
+import os
+import shutil
+
+from . import get_version
+from ..exceptions import ExitCode, MissingDependencyError
+
+
+@lru_cache(maxsize=1)
+def version():
+    return get_version('jbig2', regex=r'jbig2enc (\d+(\.\d+)*).*')
+
+
+def available():
+    try:
+        version()
+    except MissingDependencyError:
+        return False
+    return True
+
+
+def convert_group(*, cwd, infiles, out_prefix):
+    args = [
+        'jbig2',
+        '-b',
+        out_prefix,
+        '-s',  # symbol mode (lossy)
+        # '-r', # refinement mode (lossless symbol mode, currently disabled in
+                # jbig2)
+        '-p',
+    ]
+    args.extend(infiles)
+    proc = run(args, cwd=cwd, stdout=PIPE, stderr=PIPE)
+    proc.check_returncode()
+    return proc
+
+
+def convert_single(*, cwd, infile, outfile):
+    args = [
+        'jbig2',
+        '-p',
+        infile
+    ]
+    with open(outfile, 'wb') as fstdout:
+        proc = run(args, cwd=cwd, stdout=fstdout, stderr=PIPE)
+    proc.check_returncode()
+    return proc

src/ocrmypdf/exec/pngquant.py

@@ -0,0 +1,53 @@
+# © 2018 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from subprocess import CalledProcessError, run
+from tempfile import TemporaryFile
+from functools import lru_cache
+import sys
+import os
+import shutil
+
+from . import get_version
+from ..exceptions import ExitCode, MissingDependencyError
+
+
+@lru_cache(maxsize=1)
+def version():
+    return get_version('pngquant', regex=r'(\d+(\.\d+)*).*')
+
+
+def available():
+    try:
+        version()
+    except MissingDependencyError:
+        return False
+    return True
+
+
+def quantize(input_file, output_file, quality_min, quality_max):
+    args = [
+        'pngquant',
+        '--force',
+        '--skip-if-larger',
+        '--output', output_file,
+        '--quality', '{}-{}'.format(quality_min, quality_max),
+        '--',
+        input_file
+    ]
+    proc = run(args)
+    proc.check_returncode()

src/ocrmypdf/exec/qpdf.py

@@ -0,0 +1,56 @@
+# © 2017 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from subprocess import CalledProcessError, STDOUT, PIPE, run
+from functools import lru_cache
+
+from ..exceptions import InputFileError, SubprocessOutputError, \
+    EncryptedPdfError
+from . import  get_version
+
+
+@lru_cache(maxsize=1)
+def version():
+    return get_version('qpdf', regex=r'qpdf version (.+)')
+
+
+def check(input_file, log=None):
+    args_qpdf = [
+        'qpdf',
+        '--check',
+        input_file
+    ]
+
+    if log is None:
+        import logging as log
+
+    try:
+        run(args_qpdf, stderr=STDOUT, stdout=PIPE, universal_newlines=True,
+            check=True)
+    except CalledProcessError as e:
+        if e.returncode == 2:
+            log.error("%s: not a valid PDF, and could not repair it.",
+                input_file)
+            log.error("Details:")
+            log.error(e.output)
+        elif e.returncode == 3:
+            log.info("qpdf --check returned warnings:")
+            log.info(e.output)
+        else:
+            log.warning(e.output)
+        return False
+    return True

src/ocrmypdf/exec/tesseract.py

@@ -0,0 +1,360 @@
+# © 2017 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import os
+import shutil
+from functools import lru_cache
+from collections import namedtuple
+from textwrap import dedent
+from subprocess import CalledProcessError, TimeoutExpired, check_output, STDOUT
+from contextlib import suppress
+
+from ..exceptions import MissingDependencyError, TesseractConfigError
+from ..helpers import page_number
+from . import get_version
+
+OrientationConfidence = namedtuple(
+    'OrientationConfidence',
+    ('angle', 'confidence'))
+
+HOCR_TEMPLATE = """<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+ <head>
+  <title></title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+  <meta name='ocr-system' content='tesseract 3.05.00' />
+  <meta name='ocr-capabilities' content='ocr_page ocr_carea ocr_par ocr_line ocrx_word'/>
+</head>
+<body>
+  <div class='ocr_page' id='page_1' title='image "_blank.png"; bbox 0 0 {0} {1}; ppageno 0'>
+  </div>
+ </body>
+</html>
+"""
+
+
+@lru_cache(maxsize=1)
+def version():
+    return get_version('tesseract', regex=r'tesseract\s(.+)')
+
+
+def v4():
+    "Is this Tesseract v4.0?"
+    return version() >= '4'
+
+
+@lru_cache(maxsize=1)
+def has_textonly_pdf():
+    """Does Tesseract have textonly_pdf capability?
+
+    Available in 3.05.01, and v4.00.00alpha since January 2017. Best to
+    parse the parameter list
+    """
+    args_tess = [
+        'tesseract',
+        '--print-parameters',
+        'pdf'
+    ]
+    params = ''
+    try:
+        params = check_output(
+                args_tess, universal_newlines=True, stderr=STDOUT)
+    except CalledProcessError as e:
+        print("Could not --print-parameters from tesseract",
+              file=sys.stderr)
+        raise MissingDependencyError from e
+    if 'textonly_pdf' in params:
+        return True
+    return False
+
+
+def psm():
+    "If Tesseract 4.0, use argument --psm instead of -psm"
+    return '--psm' if v4() else '-psm'
+
+
+@lru_cache(maxsize=1)
+def languages():
+    args_tess = [
+        'tesseract',
+        '--list-langs'
+    ]
+    try:
+        langs = check_output(
+                args_tess, universal_newlines=True, stderr=STDOUT)
+    except CalledProcessError as e:
+        msg = dedent("""Tesseract failed to report available languages.
+        Output from Tesseract:
+        -----------
+        """)
+        msg += e.output
+        print(msg, file=sys.stderr)
+        raise MissingDependencyError from e
+    return set(lang.strip() for lang in langs.splitlines()[1:])
+
+
+def tess_base_args(langs, engine_mode):
+    args = [
+        'tesseract',
+    ]
+    if langs:
+        args.extend(['-l', '+'.join(langs)])
+    if engine_mode is not None and v4():
+        args.extend(['--oem', str(engine_mode)])
+    return args
+
+
+def get_orientation(input_file, engine_mode, timeout: float, log):
+    args_tesseract = tess_base_args(['osd'], engine_mode) + [
+        psm(), '0',
+        input_file,
+        'stdout'
+    ]
+
+    try:
+        stdout = check_output(
+            args_tesseract, stderr=STDOUT, timeout=timeout)
+    except TimeoutExpired:
+        return OrientationConfidence(angle=0, confidence=0.0)
+    except CalledProcessError as e:
+        tesseract_log_output(log, e.output, input_file)
+        if (b'Too few characters. Skipping this page' in e.output or
+                b'Image too large' in e.output):
+            return OrientationConfidence(0, 0)
+        raise e from e
+    else:
+        osd = {}
+        for line in stdout.decode().splitlines():
+            line = line.strip()
+            parts = line.split(':', maxsplit=2)
+            if len(parts) == 2:
+                osd[parts[0].strip()] = parts[1].strip()
+
+        angle = int(osd.get('Orientation in degrees', 0))
+        if 'Orientation' in osd:
+            # Tesseract < 3.04.01
+            # reports "Orientation in degrees" as a counterclockwise angle
+            # We keep it clockwise
+            assert 'Rotate' not in osd
+            angle = -angle % 360
+        else:
+            # Tesseract >= 3.04.01
+            # reports "Orientation in degrees" as a clockwise angle
+            assert 'Rotate' in osd
+
+        oc = OrientationConfidence(
+            angle=angle,
+            confidence=float(osd.get('Orientation confidence', 0)))
+        return oc
+
+
+def tesseract_log_output(log, stdout, input_file):
+    prefix = "{0:4d}: [tesseract] ".format(page_number(input_file))
+
+    try:
+        text = stdout.decode()
+    except UnicodeDecodeError:
+        log.error(prefix + "command line output was not utf-8. " +
+            "This usually means Tesseract's language packs do not match "
+            "the installed version of Tesseract.")
+        text = stdout.decode('utf-8', 'backslashreplace')
+
+    lines = text.splitlines()
+    for line in lines:
+        if line.startswith("Tesseract Open Source"):
+            continue
+        elif line.startswith("Warning in pixReadMem"):
+            continue
+        elif 'diacritics' in line:
+            log.warning(prefix + "lots of diacritics - possibly poor OCR")
+        elif line.startswith('OSD: Weak margin'):
+            log.warning(prefix + "unsure about page orientation")
+        elif 'Error in pixScanForForeground' in line:
+            pass  # Appears to be spurious/problem with nonwhite borders
+        elif 'Error in boxClipToRectangle' in line:
+            pass  # Always appears with pixScanForForeground message
+        elif 'parameter not found: ' in line.lower():
+            log.error(prefix + line.strip())
+            problem = line.split('found: ')[1]
+            raise TesseractConfigError(problem)
+        elif 'error' in line.lower() or 'exception' in line.lower():
+            log.error(prefix + line.strip())
+        elif 'warning' in line.lower():
+            log.warning(prefix + line.strip())
+        elif 'read_params_file' in line.lower():
+            log.error(prefix + line.strip())
+        else:
+            log.info(prefix + line.strip())
+
+
+def page_timedout(log, input_file):
+    prefix = "{0:4d}: [tesseract] ".format(page_number(input_file))
+    log.warning(prefix + " took too long to OCR - skipping")
+
+
+def _generate_null_hocr(output_hocr, output_sidecar, image):
+    """Produce a .hocr file that reports no text detected on a page that is
+    the same size as the input image."""
+    from PIL import Image
+
+    im = Image.open(image)
+    w, h = im.size
+
+    with open(output_hocr, 'w', encoding="utf-8") as f:
+        f.write(HOCR_TEMPLATE.format(w, h))
+    with open(output_sidecar, 'w', encoding='utf-8') as f:
+        f.write('[skipped page]')
+
+
+def generate_hocr(input_file, output_files, language: list, engine_mode,
+                  tessconfig: list,
+                  timeout: float, pagesegmode: int, user_words, user_patterns,
+                  log):
+
+    output_hocr = next(o for o in output_files if o.endswith('.hocr'))
+    output_sidecar = next(o for o in output_files if o.endswith('.txt'))
+    prefix = os.path.splitext(output_hocr)[0]
+
+    args_tesseract = tess_base_args(language, engine_mode)
+
+    if pagesegmode is not None:
+        args_tesseract.extend([psm(), str(pagesegmode)])
+
+    if user_words:
+        args_tesseract.extend(['--user-words', user_words])
+
+    if user_patterns:
+        args_tesseract.extend(['--user-patterns', user_patterns])
+
+    # Reminder: test suite tesseract spoofers will break after any changes
+    # to the number of order parameters here
+    # Tesseract 3.04 requires the order here to be "hocr txt" and will fail
+    # on "txt hocr"
+
+    args_tesseract.extend([
+        input_file,
+        prefix,
+        'hocr',
+        'txt'
+    ] + tessconfig)
+    try:
+        log.debug(args_tesseract)
+        stdout = check_output(
+            args_tesseract, stderr=STDOUT,
+            timeout=timeout)
+    except TimeoutExpired:
+        # Generate a HOCR file with no recognized text if tesseract times out
+        # Temporary workaround to hocrTransform not being able to function if
+        # it does not have a valid hOCR file.
+        page_timedout(log, input_file)
+        _generate_null_hocr(output_hocr, output_sidecar, input_file)
+    except CalledProcessError as e:
+        tesseract_log_output(log, e.output, input_file)
+        if b'Image too large' in e.output:
+            _generate_null_hocr(output_hocr, output_sidecar, input_file)
+            return
+
+        raise e from e
+    else:
+        tesseract_log_output(log, stdout, input_file)
+        # The sidecar text file will get the suffix .txt; rename it to
+        # whatever caller wants it named
+        if os.path.exists(prefix + '.txt'):
+            shutil.move(prefix + '.txt', output_sidecar)
+
+
+def use_skip_page(text_only, skip_pdf, output_pdf, output_text):
+    with open(output_text, 'w') as f:
+        f.write('[skipped page]')
+
+    if skip_pdf and not text_only:
+        # Substitute a "skipped page"
+        with suppress(FileNotFoundError):
+            os.remove(output_pdf)  # In case it was partially created
+        os.symlink(skip_pdf, output_pdf)
+        return
+
+    # Or normally, just write a 0 byte file to the output to indicate a skip
+    with open(output_pdf, 'wb') as out:
+        out.write(b'')
+
+
+def generate_pdf(*, input_image, skip_pdf=None, output_pdf, output_text,
+                 language: list, engine_mode, text_only: bool,
+                 tessconfig: list, timeout: float, pagesegmode: int,
+                 user_words, user_patterns, log):
+    '''Use Tesseract to render a PDF.
+
+    input_image -- image to analyze
+    skip_pdf -- if we time out, use this file as output
+    output_pdf -- file to generate
+    output_text -- OCR text file
+    language -- list of languages to consider
+    engine_mode -- engine mode argument for tess v4
+    text_only -- enable tesseract text only mode?
+    tessconfig -- tesseract configuration
+    timeout -- timeout (seconds)
+    log -- logger object
+    '''
+
+    args_tesseract = tess_base_args(language, engine_mode)
+
+    if pagesegmode is not None:
+        args_tesseract.extend([psm(), str(pagesegmode)])
+
+    if text_only and has_textonly_pdf():
+        args_tesseract.extend(['-c', 'textonly_pdf=1'])
+
+    if user_words:
+        args_tesseract.extend(['--user-words', user_words])
+
+    if user_patterns:
+        args_tesseract.extend(['--user-patterns', user_patterns])
+
+    prefix = os.path.splitext(output_pdf)[0]  # Tesseract appends suffixes
+
+    # Reminder: test suite tesseract spoofers might break after any changes
+    # to the number of order parameters here
+
+    args_tesseract.extend([
+        input_image,
+        prefix,
+        'pdf',
+        'txt'
+    ] + tessconfig)
+
+    try:
+        log.debug(args_tesseract)
+        stdout = check_output(
+            args_tesseract, stderr=STDOUT,
+            timeout=timeout)
+        if os.path.exists(prefix + '.txt'):
+            shutil.move(prefix + '.txt', output_text)
+    except TimeoutExpired:
+        page_timedout(log, input_image)
+        use_skip_page(text_only, skip_pdf, output_pdf, output_text)
+    except CalledProcessError as e:
+        tesseract_log_output(log, e.output, input_image)
+        if b'Image too large' in e.output:
+            use_skip_page(text_only, skip_pdf, output_pdf, output_text)
+            return
+        raise e from e
+    else:
+        tesseract_log_output(log, stdout, input_image)

src/ocrmypdf/exec/unpaper.py

@@ -1,27 +1,30 @@
-#!/usr/bin/env python3
 # © 2015 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
 # unpaper documentation:
 # https://github.com/Flameeyes/unpaper/blob/master/doc/basic-concepts.md
 
-from subprocess import Popen, PIPE
+from subprocess import CalledProcessError, STDOUT, check_output
 from tempfile import NamedTemporaryFile
 import sys
 import os
 from functools import lru_cache
-from . import ExitCode
-
-
-@lru_cache(maxsize=1)
-def version():
-    args_unpaper = [
-        'unpaper',
-        '--version'
-    ]
-    p_unpaper = Popen(args_unpaper, close_fds=True, universal_newlines=True,
-                      stdout=PIPE, stderr=PIPE)
-    version, _ = p_unpaper.communicate(timeout=5)
-
-    return version.strip()
+from ..exceptions import MissingDependencyError
+from . import get_version
 
 
 try:
@@ -31,6 +34,11 @@ except ImportError:
     raise
 
 
+@lru_cache(maxsize=1)
+def version():
+    return get_version('unpaper')
+
+
 def run(input_file, output_file, dpi, log, mode_args):
     args_unpaper = [
         'unpaper',
@@ -48,17 +56,17 @@ def run(input_file, output_file, dpi, log, mode_args):
                 im = im.convert(mode='1')
             else:
                 im = im.convert(mode='RGB')
-        except IOError:
-            log.error(
-                    "Could not convert image with type " + im.mode)
-            sys.exit(ExitCode.missing_dependency)
+        except IOError as e:
+            log.error("Could not convert image with type " + im.mode)
+            im.close()
+            raise MissingDependencyError() from e
 
     try:
         suffix = SUFFIXES[im.mode]
     except KeyError:
-        log.error(
-                "Failed to convert image to a supported format.")
-        sys.exit(ExitCode.missing_dependency)
+        log.error("Failed to convert image to a supported format.")
+        im.close()
+        raise MissingDependencyError() from e
 
     with NamedTemporaryFile(suffix=suffix) as input_pnm, \
             NamedTemporaryFile(suffix=suffix, mode="r+b") as output_pnm:
@@ -68,31 +76,23 @@ def run(input_file, output_file, dpi, log, mode_args):
         os.unlink(output_pnm.name)
 
         args_unpaper.extend([input_pnm.name, output_pnm.name])
-        p_unpaper = Popen(
-            args_unpaper, close_fds=True,
-            universal_newlines=True, stdout=PIPE, stderr=PIPE
-            )
-        out, err = p_unpaper.communicate()
-        log.debug(out)
-        log.debug(err)
-
-        Image.open(output_pnm.name).save(output_file)
-
-
-def deskew(input_file, output_file, dpi, log):
-    run(input_file, output_file, dpi, log, [
-        '--mask-scan-size', '100',  # don't blank out narrow columns
-        '--no-border-align',  # don't align visible content to borders
-        '--no-mask-center',   # don't center visible content within page
-        '--no-grayfilter',    # don't remove light gray areas
-        '--no-blackfilter',   # don't remove solid black areas
-        '--no-noisefilter',   # don't remove salt and pepper noise
-        '--no-blurfilter'     # don't remove blurry objects/debris
-    ])
+        try:
+            stdout = check_output(
+                args_unpaper, close_fds=True,
+                universal_newlines=True, stderr=STDOUT,
+                )
+        except CalledProcessError as e:
+            log.debug(e.output)
+            raise e from e
+        else:
+            log.debug(stdout)
+            # unpaper sets dpi to 72
+            Image.open(output_pnm.name).save(output_file, dpi=(dpi, dpi))
 
 
 def clean(input_file, output_file, dpi, log):
     run(input_file, output_file, dpi, log, [
+        '--layout', 'none',
         '--mask-scan-size', '100',  # don't blank out narrow columns
         '--no-border-align',  # don't align visible content to borders
         '--no-mask-center',   # don't center visible content within page

src/ocrmypdf/helpers.py

@@ -0,0 +1,170 @@
+# © 2016 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from functools import partial
+from collections.abc import Iterable
+from contextlib import suppress
+from pathlib import Path
+import sys
+import os
+import multiprocessing
+import warnings
+
+
+def re_symlink(input_file, soft_link_name, log=None):
+    """
+    Helper function: relinks soft symbolic link if necessary
+    """
+    input_file = fspath(input_file)  # For Py3.5
+    soft_link_name = fspath(soft_link_name)
+    if log is None:
+        prdebug = partial(print, file=sys.stderr)
+    else:
+        prdebug = log.debug
+
+    # Guard against soft linking to oneself
+    if input_file == soft_link_name:
+        prdebug("Warning: No symbolic link made. You are using " +
+                "the original data directory as the working directory.")
+        return
+
+    # Soft link already exists: delete for relink?
+    if os.path.lexists(soft_link_name):
+        # do not delete or overwrite real (non-soft link) file
+        if not os.path.islink(soft_link_name):
+            raise FileExistsError(
+                "%s exists and is not a link" % soft_link_name)
+        try:
+            os.unlink(soft_link_name)
+        except OSError:
+            prdebug("Can't unlink %s" % (soft_link_name))
+
+    if not os.path.exists(input_file):
+        raise FileNotFoundError(
+            "trying to create a broken symlink to %s" % input_file)
+
+    prdebug("os.symlink(%s, %s)" % (input_file, soft_link_name))
+
+    # Create symbolic link using absolute path
+    os.symlink(
+        os.path.abspath(input_file),
+        soft_link_name
+    )
+
+
+def is_iterable_notstr(thing):
+    return isinstance(thing, Iterable) and not isinstance(thing, str)
+
+
+def page_number(input_file):
+    """Get one-based page number implied by filename (000002.pdf -> 2)"""
+    return int(os.path.basename(fspath(input_file))[0:6])
+
+
+def available_cpu_count():
+    try:
+        return multiprocessing.cpu_count()
+    except NotImplementedError:
+        pass
+
+    try:
+        import psutil
+        return psutil.cpu_count()
+    except (ImportError, AttributeError):
+        pass
+
+    warnings.warn(
+        "Could not get CPU count.  Assuming one (1) CPU."
+        "Use -j N to set manually.")
+    return 1
+
+
+def is_file_writable(test_file):
+    """Intentionally racy test if target is writable.
+
+    We intend to write to the output file if and only if we succeed and
+    can replace it atomically. Before doing the OCR work, make sure
+    the location is writable.
+    """
+    p = Path(test_file)
+
+    if p.is_symlink():
+        # Python 3.5 does not accept parameters for Path.resolve() and behaves
+        # as if strict=True (throws an exception on failure). Python 3.6
+        # defaults to strict=False. This implements strict=False like behavior
+        # for Python 3.5.
+        if sys.version_info[0:2] <= (3, 5):
+            p = Path(os.path.realpath(fspath(p)))
+        else:
+            p = p.resolve(strict=False)
+
+    # p.is_file() throws an exception in some cases
+    if p.exists() and p.is_file():
+        return os.access(
+            fspath(p), os.W_OK,
+            effective_ids=(os.access in os.supports_effective_ids))
+    else:
+        try:
+            fp = p.open('wb')
+        except OSError:
+            return False
+        else:
+            fp.close()
+            with suppress(OSError):
+                p.unlink()
+        return True
+
+
+if sys.version_info[0:2] <= (3, 5):
+    def fspath(path):
+        """https://www.python.org/dev/peps/pep-0519/#os"""
+        import pathlib
+        if isinstance(path, (str, bytes)):
+            return path
+
+        # Work from the object's type to match method resolution of other magic
+        # methods.
+        path_type = type(path)
+        try:
+            path = path_type.__fspath__(path)
+        except AttributeError:
+            # Added for Python 3.5 support.
+            if isinstance(path, pathlib.Path):
+                return str(path)
+            elif hasattr(path_type, '__fspath__'):
+                raise
+        else:
+            if isinstance(path, (str, bytes)):
+                return path
+            else:
+                raise TypeError("expected __fspath__() to return str or bytes, "
+                                "not " + type(path).__name__)
+
+        raise TypeError(
+            "expected str, bytes, pathlib.Path or os.PathLike object, not "
+            + path_type.__name__)
+
+else:
+    fspath = os.fspath
+
+
+def flatten_groups(groups):
+    for obj in groups:
+        if is_iterable_notstr(obj):
+            yield from obj
+        else:
+            yield obj

src/ocrmypdf/hocrtransform.py

@@ -0,0 +1,349 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2010, Jonathan Brinley
+#   Original version from: https://github.com/jbrinley/HocrConverter
+#
+# Copyright (c) 2013-14, Julien Pfefferkorn
+#   Modifications
+#
+# Copyright (c) 2015-16, James R. Barlow
+#   Set text to transparent
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+from reportlab.pdfgen.canvas import Canvas
+from reportlab.lib.units import inch
+from xml.etree import ElementTree
+from collections import namedtuple
+from math import atan, sin, cos
+import re
+import argparse
+
+
+Rect = namedtuple('Rect', ['x1', 'y1', 'x2', 'y2'])
+
+
+class HocrTransformError(Exception):
+    pass
+
+
+class HocrTransform():
+
+    """
+    A class for converting documents from the hOCR format.
+    For details of the hOCR format, see:
+    http://kba.cloud/hocr-spec/
+    """
+
+    box_pattern = re.compile(r'bbox((\s+\d+){4})')
+    baseline_pattern = re.compile(r'''
+        baseline \s+
+        ([\-\+]?\d*\.?\d*) \s+  # +/- decimal float
+        ([\-\+]?\d+)            # +/- int''', re.VERBOSE)
+    ligatures = str.maketrans({
+        'ff': 'ff',
+        'ffi': 'f‌f‌i',
+        'ffl': 'f‌f‌l',
+        'fi': 'fi',
+        'fl': 'fl',
+    })
+
+    def __init__(self, hocrFileName, dpi):
+        self.dpi = dpi
+        self.hocr = ElementTree.parse(hocrFileName)
+
+        # if the hOCR file has a namespace, ElementTree requires its use to
+        # find elements
+        matches = re.match(r'({.*})html', self.hocr.getroot().tag)
+        self.xmlns = ''
+        if matches:
+            self.xmlns = matches.group(1)
+
+        # get dimension in pt (not pixel!!!!) of the OCRed image
+        self.width, self.height = None, None
+        for div in self.hocr.findall(
+                ".//%sdiv[@class='ocr_page']" % (self.xmlns)):
+            coords = self.element_coordinates(div)
+            pt_coords = self.pt_from_pixel(coords)
+            self.width = pt_coords.x2 - pt_coords.x1
+            self.height = pt_coords.y2 - pt_coords.y1
+            # there shouldn't be more than one, and if there is, we don't want
+            # it
+            break
+        if self.width is None or self.height is None:
+            raise HocrTransformError("hocr file is missing page dimensions")
+
+    def __str__(self):
+        """
+        Return the textual content of the HTML body
+        """
+        if self.hocr is None:
+            return ''
+        body = self.hocr.find(".//%sbody" % (self.xmlns))
+        if body:
+            return self._get_element_text(body)
+        else:
+            return ''
+
+    def _get_element_text(self, element):
+        """
+        Return the textual content of the element and its children
+        """
+        text = ''
+        if element.text is not None:
+            text += element.text
+        for child in element.getchildren():
+            text += self._get_element_text(child)
+        if element.tail is not None:
+            text += element.tail
+        return text
+
+    @classmethod
+    def element_coordinates(cls, element):
+        """
+        Returns a tuple containing the coordinates of the bounding box around
+        an element
+        """
+        out = (0, 0, 0, 0)
+        if 'title' in element.attrib:
+            matches = cls.box_pattern.search(element.attrib['title'])
+            if matches:
+                coords = matches.group(1).split()
+                out = Rect._make(int(coords[n]) for n in range(4))
+        return out
+
+    @classmethod
+    def baseline(cls, element):
+        """
+        Returns a tuple containing the baseline slope and intercept.
+        """
+        if 'title' in element.attrib:
+            matches = cls.baseline_pattern.search(element.attrib['title'])
+            if matches:
+                return float(matches.group(1)), int(matches.group(2))
+        return (0, 0)
+
+    def pt_from_pixel(self, pxl):
+        """
+        Returns the quantity in PDF units (pt) given quantity in pixels
+        """
+        return Rect._make(
+            (c / self.dpi * inch) for c in pxl)
+
+    @classmethod
+    def replace_unsupported_chars(cls, s):
+        """
+        Given an input string, returns the corresponding string that:
+        - is available in the helvetica facetype
+        - does not contain any ligature (to allow easy search in the PDF file)
+        """
+        return s.translate(cls.ligatures)
+
+    def to_pdf(self, outFileName, imageFileName=None, showBoundingboxes=False,
+               fontname="Helvetica", invisibleText=False, interwordSpaces=False):
+        """
+        Creates a PDF file with an image superimposed on top of the text.
+        Text is positioned according to the bounding box of the lines in
+        the hOCR file.
+        The image need not be identical to the image used to create the hOCR
+        file.
+        It can have a lower resolution, different color mode, etc.
+        """
+        # create the PDF file
+        # page size in points (1/72 in.)
+        pdf = Canvas(
+            outFileName, pagesize=(self.width, self.height), pageCompression=1)
+
+        # draw bounding box for each paragraph
+        # light blue for bounding box of paragraph
+        pdf.setStrokeColorRGB(0, 1, 1)
+        # light blue for bounding box of paragraph
+        pdf.setFillColorRGB(0, 1, 1)
+        pdf.setLineWidth(0)		# no line for bounding box
+        for elem in self.hocr.findall(
+                ".//%sp[@class='%s']" % (self.xmlns, "ocr_par")):
+
+            elemtxt = self._get_element_text(elem).rstrip()
+            if len(elemtxt) == 0:
+                continue
+
+            pxl_coords = self.element_coordinates(elem)
+            pt = self.pt_from_pixel(pxl_coords)
+
+            # draw the bbox border
+            if showBoundingboxes:
+                pdf.rect(
+                    pt.x1, self.height - pt.y2, pt.x2 - pt.x1, pt.y2 - pt.y1,
+                    fill=1)
+
+        found_lines = False
+        for line in self.hocr.findall(
+                ".//%sspan[@class='%s']" % (self.xmlns, "ocr_line")):
+            found_lines = True
+            self._do_line(pdf, line, "ocrx_word", fontname, invisibleText,
+                          interwordSpaces, showBoundingboxes)
+
+        if not found_lines:
+            # Tesseract did not report any lines (just words)
+            root = self.hocr.find(".//%sdiv[@class='%s']" % (self.xmlns, "ocr_page"))
+            self._do_line(pdf, root, "ocrx_word", fontname, invisibleText,
+                          interwordSpaces, showBoundingboxes)
+        # put the image on the page, scaled to fill the page
+        if imageFileName is not None:
+            pdf.drawImage(imageFileName, 0, 0,
+                          width=self.width, height=self.height)
+
+        # finish up the page and save it
+        pdf.showPage()
+        pdf.save()
+
+
+    @classmethod
+    def polyval(cls, poly, x):
+        return x * poly[0] + poly[1]
+
+
+    def _do_line(self, pdf, line, elemclass, fontname, invisibleText,
+                 interwordSpaces, showBoundingboxes):
+        pxl_line_coords = self.element_coordinates(line)
+        line_box = self.pt_from_pixel(pxl_line_coords)
+        line_height = line_box.y2 - line_box.y1
+
+        slope, pxl_intercept = self.baseline(line)
+        if abs(slope) < 0.005:
+            slope = 0.0
+        angle = atan(slope)
+        cos_a, sin_a = cos(angle), sin(angle)
+
+        text = pdf.beginText()
+        intercept = pxl_intercept / self.dpi * inch
+
+        # Don't allow the font to break out of the bounding box. Division by
+        # cos_a accounts for extra clearance between the glyph's vertical axis
+        # on a sloped baseline and the edge of the bounding box.
+        fontsize = (line_height - abs(intercept)) / cos_a
+        text.setFont(fontname, fontsize)
+        if invisibleText:
+            text.setTextRenderMode(3)  # Invisible (indicates OCR text)
+
+        # Intercept is normally negative, so this places it above the bottom
+        # of the line box
+        baseline_y2 = self.height - (line_box.y2 + intercept)
+
+        if showBoundingboxes:
+            # draw the baseline in magenta, dashed
+            pdf.setDash()
+            pdf.setStrokeColorRGB(0.95, 0.65, 0.95)
+            pdf.setLineWidth(0.5)
+            # negate slope because it is defined as a rise/run in pixel
+            # coordinates and page coordinates have the y axis flipped
+            pdf.line(line_box.x1,
+                     baseline_y2,
+                     line_box.x2,
+                     self.polyval((-slope, baseline_y2),
+                                  line_box.x2 - line_box.x1))
+            # light green for bounding box of word/line
+            pdf.setDash(6, 3)
+            pdf.setStrokeColorRGB(1, 0, 0)
+
+        text.setTextTransform(
+            cos_a, -sin_a, sin_a, cos_a,
+            line_box.x1, baseline_y2
+        )
+        pdf.setFillColorRGB(0, 0, 0)  # text in black
+
+        elements = line.findall(
+                ".//%sspan[@class='%s']" % (self.xmlns, elemclass))
+        for elem in elements:
+            elemtxt = self._get_element_text(elem).strip()
+            elemtxt = self.replace_unsupported_chars(elemtxt)
+            if elemtxt == '':
+                continue
+
+            pxl_coords = self.element_coordinates(elem)
+            box = self.pt_from_pixel(pxl_coords)
+            if interwordSpaces:
+                # if  `--interword-spaces` is true, append a space
+                # to the end of each text element to allow simpler PDF viewers
+                # such as PDF.js to better recognize words in search and copy
+                # and paste. Do not remove space from last word in line, even
+                # though it would look better, because it will interfere with
+                # naive text extraction. \n does not work either.
+                elemtxt += ' '
+                box = Rect._make((
+                    box.x1,
+                    line_box.y1,
+                    box.x2 + pdf.stringWidth(' ', fontname, line_height),
+                    line_box.y2))
+            box_width = box.x2 - box.x1
+            font_width = pdf.stringWidth(elemtxt, fontname, fontsize)
+
+            # draw the bbox border
+            if showBoundingboxes:
+                pdf.rect(
+                    box.x1,
+                    self.height - line_box.y2,
+                    box_width,
+                    line_height,
+                    fill=0)
+
+            # Adjust relative position of cursor
+            # This is equivalent to:
+            #   text.setTextOrigin(pt.x1, self.height - line_box.y2)
+            # but the former generates a full text reposition matrix (Tm) in the
+            # content stream while this issues a "offset" (Td) command.
+            # .moveCursor() is relative to start of the text line, where the
+            # "text line" means whatever reportlab defines it as. Do not use
+            # use .getCursor(), since moveCursor() rather unintuitively plans
+            # its moves relative to .getStartOfLine().
+            # For skewed lines, in the text transform we set up a rotated
+            # coordinate system, so we don't have to account for the
+            # incremental offset. Surprisingly most PDF viewers can handle this.
+            cursor = text.getStartOfLine()
+            dx = box.x1 - cursor[0]
+            dy = baseline_y2 - cursor[1]
+            text.moveCursor(dx, dy)
+
+            # If reportlab tells us this word is 0 units wide, our best seems
+            # to be to suppress this text
+            if font_width > 0:
+                text.setHorizScale(100 * box_width / font_width)
+                text.textOut(elemtxt)
+        pdf.drawText(text)
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='Convert hocr file to PDF')
+    parser.add_argument('-b', '--boundingboxes', action="store_true",
+                        default=False, help='Show bounding boxes borders')
+    parser.add_argument('-r', '--resolution', type=int,
+                        default=300,
+                        help='Resolution of the image that was OCRed')
+    parser.add_argument('-i', '--image', default=None,
+                        help='Path to the image to be placed above the text')
+    parser.add_argument('--interword-spaces', action='store_true',
+                         default=False, help='Add spaces between words')
+    parser.add_argument('hocrfile', help='Path to the hocr file to be parsed')
+    parser.add_argument(
+        'outputfile', help='Path to the PDF file to be generated')
+    args = parser.parse_args()
+
+    hocr = HocrTransform(args.hocrfile, args.resolution)
+    hocr.to_pdf(args.outputfile, args.image, args.boundingboxes, interwordSpaces=args.interword_spaces)

src/ocrmypdf/leptonica.py

@@ -0,0 +1,632 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# © 2013-16: jbarlow83 from Github (https://github.com/jbarlow83)
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Python FFI wrapper for Leptonica library
+
+import argparse
+import sys
+import os
+import logging
+import warnings
+from tempfile import TemporaryFile
+from ctypes.util import find_library
+from functools import lru_cache
+
+from .lib._leptonica import ffi
+from .helpers import fspath
+
+# pylint: disable=protected-access
+
+lept = ffi.dlopen(find_library('lept'))
+
+logger = logging.getLogger(__name__)
+
+
+def stderr(*objs):
+    """Shorthand print to stderr."""
+    print("leptonica.py:", *objs, file=sys.stderr)
+
+
+class _LeptonicaErrorTrap:
+    """
+    Context manager to trap errors reported by Leptonica.
+
+    Leptonica's error return codes don't provide much informatino about what
+    went wrong. Leptonica does, however, write more detailed errors to stderr
+    (provided this is not disabled at compile time). The Leptonica source
+    code is very consistent in its use of macros to generate errors.
+
+    This context manager redirects stderr to a temporary file which is then
+    read and parsed for error messages.  As a side benefit, debug messages
+    from Leptonica are also suppressed.
+
+    """
+
+    def __init__(self):
+        self.tmpfile = None
+        self.copy_of_stderr = -1
+
+    def __enter__(self):
+        from io import UnsupportedOperation
+        self.tmpfile = TemporaryFile()
+
+        # Save the old stderr, and redirect stderr to temporary file
+        sys.stderr.flush()
+        try:
+            self.copy_of_stderr = os.dup(sys.stderr.fileno())
+            os.dup2(self.tmpfile.fileno(), sys.stderr.fileno(),
+                    inheritable=False)
+        except UnsupportedOperation:
+            self.copy_of_stderr = None
+        return
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        # Restore old stderr
+        sys.stderr.flush()
+        if self.copy_of_stderr is not None:
+            os.dup2(self.copy_of_stderr, sys.stderr.fileno())
+            os.close(self.copy_of_stderr)
+
+        # Get data from tmpfile (in with block to ensure it is closed)
+        with self.tmpfile as tmpfile:
+            tmpfile.seek(0)  # Cursor will be at end, so move back to beginning
+            leptonica_output = tmpfile.read().decode(errors='replace')
+
+        assert self.tmpfile.closed
+        assert not sys.stderr.closed
+
+        # If there are Python errors, let them bubble up
+        if exc_type:
+            logger.warning(leptonica_output)
+            return False
+
+        # If there are Leptonica errors, wrap them in Python excpetions
+        if 'Error' in leptonica_output:
+            if 'image file not found' in leptonica_output:
+                raise FileNotFoundError()
+            if 'pixWrite: stream not opened' in leptonica_output:
+                raise LeptonicaIOError()
+            raise LeptonicaError(leptonica_output)
+
+        return False
+
+
+class LeptonicaError(Exception):
+    pass
+
+
+class LeptonicaIOError(LeptonicaError):
+    pass
+
+
+class Pix:
+    """
+    Wrapper around leptonica's PIX object.
+
+    Leptonica uses referencing counting on PIX objects. Also, many Leptonica
+    functions return the original object with an increased reference count
+    if the operation had no effect (for example, image skew was found to be 0).
+    This has complications for memory management in Python. Whenever Leptonica
+    returns a PIX object (new or old), we wrap it in this class, which
+    registers it with the FFI garbage collector. pixDestroy() decrements the
+    reference count and only destroys when the last reference is removed.
+
+    Leptonica's reference counting is not threadsafe. This class can be used
+    in a threadsafe manner if a Python threading.Lock protects the data.
+
+    This class treats Pix objects as immutable.  All methods return new
+    modified objects.  This allows convenient chaining:
+
+    >>>   Pix.open('filename.jpg').scale((0.5, 0.5)).deskew().show()
+
+    """
+
+    def __init__(self, pix):
+        self._pix = ffi.gc(pix, Pix._pix_destroy)
+
+    def __repr__(self):
+        if self._pix:
+            s = "<leptonica.Pix image size={0}x{1} depth={2}{4} at 0x{3:x}>"
+            return s.format(self._pix.w, self._pix.h, self._pix.d,
+                            int(ffi.cast('intptr_t', self._pix)),
+                            '(colormapped)' if self._pix.colormap else '')
+        else:
+            return "<leptonica.Pix image NULL>"
+
+    def _repr_png_(self):
+        """iPython display hook
+
+        returns png version of image
+        """
+
+        data = ffi.new('l_uint8 **')
+        size = ffi.new('size_t *')
+
+        err = lept.pixWriteMemPng(data, size, self._pix, 0)
+        if err != 0:
+            raise LeptonicaIOError("pixWriteMemPng")
+
+        char_data = ffi.cast('char *', data[0])
+        return ffi.buffer(char_data, size[0])[:]
+
+    def __getstate__(self):
+        data = ffi.new('l_uint32 **')
+        size = ffi.new('size_t *')
+
+        err = lept.pixSerializeToMemory(self._pix, data, size)
+        if err != 0:
+            raise LeptonicaIOError("pixSerializeToMemory")
+
+        char_data = ffi.cast('char *', data[0])
+
+        # Copy from C bytes to python bytes()
+        data_bytes = ffi.buffer(char_data, size[0])[:]
+
+        # Can now free C bytes
+        lept.lept_free(char_data)
+        return dict(data=data_bytes)
+
+    def __setstate__(self, state):
+        cdata_bytes = ffi.new('char[]', state['data'])
+        cdata_uint32 = ffi.cast('l_uint32 *', cdata_bytes)
+
+        pix = lept.pixDeserializeFromMemory(
+            cdata_uint32, len(state['data']))
+        Pix.__init__(self, pix)
+
+    def __eq__(self, other):
+        return self.__getstate__() == other.__getstate__()
+
+    @property
+    def width(self):
+        return self._pix.w
+
+    @property
+    def height(self):
+        return self._pix.h
+
+    @property
+    def depth(self):
+        return self._pix.d
+
+    @property
+    def size(self):
+        return (self._pix.w, self._pix.h)
+
+    @property
+    def info(self):
+        return {'dpi': (self._pix.xres, self._pix.yres)}
+
+    @property
+    def mode(self):
+        "Return mode like PIL.Image"
+        if self.depth == 1:
+            return '1'
+        elif self.depth >= 16:
+            return 'RGB'
+        elif not self._pix.colormap:
+            return 'L'
+        else:
+            return 'P'
+
+    @classmethod
+    def read(cls, path):
+        warnings.warn('Use Pix.open() instead', DeprecationWarning)
+        return cls.open(path)
+
+    @classmethod
+    def open(cls, path):
+        """Load an image file into a PIX object.
+
+        Leptonica can load TIFF, PNM (PBM, PGM, PPM), PNG, and JPEG.  If
+        loading fails then the object will wrap a C null pointer.
+        """
+        filename = fspath(path)
+        with _LeptonicaErrorTrap():
+            return cls(lept.pixRead(os.fsencode(filename)))
+
+    def write_implied_format(
+            self, path, jpeg_quality=0, jpeg_progressive=0):
+        """Write pix to the filename, with the extension indicating format.
+
+        jpeg_quality -- quality (iff JPEG; 1 - 100, 0 for default)
+        jpeg_progressive -- (iff JPEG; 0 for baseline seq., 1 for progressive)
+        """
+        filename = fspath(path)
+        with _LeptonicaErrorTrap():
+            lept.pixWriteImpliedFormat(
+                os.fsencode(filename),
+                self._pix, jpeg_quality, jpeg_progressive)
+
+    def topil(self):
+        "Returns a PIL.Image version of this Pix"
+        from PIL import Image
+
+        # Leptonica manages data in words, so it implicitly does an endian
+        # swap.  Tell Pillow about this when it reads the data.
+        pix = self
+        if sys.byteorder == 'little':
+            if self.mode == 'RGB':
+                raw_mode = 'XBGR'
+            elif self.mode == 'RGBA':
+                raw_mode = 'ABGR'
+            elif self.mode == '1':
+                raw_mode = '1;I'
+                pix = Pix(lept.pixEndianByteSwapNew(pix._pix))
+            else:
+                raw_mode = self.mode
+                pix = Pix(lept.pixEndianByteSwapNew(pix._pix))
+        else:
+            raw_mode = self.mode  # no endian swap needed
+
+        size = (pix._pix.w, pix._pix.h)
+        bytecount = pix._pix.wpl * 4 * pix._pix.h
+        buf = ffi.buffer(pix._pix.data, bytecount)
+        stride = pix._pix.wpl * 4
+
+        im = Image.frombytes(self.mode, size, buf, 'raw', raw_mode, stride)
+
+        return im
+
+    def show(self):
+        return self.topil().show()
+
+    def deskew(self, reduction_factor=0):
+        """Returns the deskewed pix object.
+
+        A clone of the original is returned when the algorithm cannot find a
+        skew angle with sufficient confidence.
+
+        reduction_factor -- amount to downsample (0 for default) when searching
+            for skew angle
+        """
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixDeskew(self._pix, reduction_factor))
+
+    def scale(self, scale_xy):
+        "Returns the pix object rescaled according to the proportions given."
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixScale(self._pix, scale_xy[0], scale_xy[1]))
+
+    def rotate180(self):
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixRotate180(ffi.NULL, self._pix))
+
+    def rotate_orth(self, quads):
+        "Orthographic rotation, quads: 0-3, number of clockwise rotations"
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixRotateOrth(self._pix, quads))
+
+    def find_skew(self):
+        """Returns a tuple (deskew angle in degrees, confidence value).
+
+        Returns (None, None) if no angle is available.
+        """
+        with _LeptonicaErrorTrap():
+            angle = ffi.new('float *', 0.0)
+            confidence = ffi.new('float *', 0.0)
+            result = lept.pixFindSkew(self._pix, angle, confidence)
+            if result == 0:
+                return (angle[0], confidence[0])
+            else:
+                return (None, None)
+
+    def convert_rgb_to_luminance(self):
+        with _LeptonicaErrorTrap():
+            gray_pix = lept.pixConvertRGBToLuminance(self._pix)
+            if gray_pix:
+                return Pix(gray_pix)
+            return None
+
+    def remove_colormap(self, removal_type):
+        """Remove a palette (colormap); if no colormap, returns a copy of this
+        image
+
+            removal_type - any of lept.REMOVE_CMAP_*
+
+        """
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixRemoveColormapGeneral(
+                    self._pix, removal_type, lept.L_COPY))
+
+    def otsu_adaptive_threshold(
+            self, tile_size=(300, 300), kernel_size=(4, 4), scorefract=0.1):
+        with _LeptonicaErrorTrap():
+            sx, sy = tile_size
+            smoothx, smoothy = kernel_size
+            p_pix = ffi.new('PIX **')
+
+            result = lept.pixOtsuAdaptiveThreshold(
+                self._pix,
+                sx, sy,
+                smoothx, smoothy,
+                scorefract,
+                ffi.NULL,
+                p_pix)
+            if result == 0:
+                return Pix(p_pix[0])
+            else:
+                return None
+
+    def otsu_threshold_on_background_norm(
+            self, mask=None, tile_size=(10, 15), thresh=100, mincount=50,
+            bgval=255, kernel_size=(2, 2), scorefract=0.1):
+        with _LeptonicaErrorTrap():
+            sx, sy = tile_size
+            smoothx, smoothy = kernel_size
+            if mask is None:
+                mask = ffi.NULL
+            if isinstance(mask, Pix):
+                mask = mask._pix
+
+            thresh_pix = lept.pixOtsuThreshOnBackgroundNorm(
+                self._pix,
+                mask,
+                sx, sy,
+                thresh, mincount, bgval,
+                smoothx, smoothy,
+                scorefract,
+                ffi.NULL
+                )
+            if thresh_pix == ffi.NULL:
+                return None
+            return Pix(thresh_pix)
+
+    def crop_to_foreground(
+            self, threshold=128, mindist=70, erasedist=30, pagenum=0,
+            showmorph=0, display=0, pdfdir=ffi.NULL):
+        with _LeptonicaErrorTrap():
+            cropbox = Box(lept.pixFindPageForeground(
+                self._pix,
+                threshold,
+                mindist,
+                erasedist,
+                pagenum,
+                showmorph,
+                display,
+                pdfdir))
+
+            print(repr(cropbox))
+
+            cropped_pix = lept.pixClipRectangle(
+                self._pix,
+                cropbox._box,
+                ffi.NULL)
+
+            return Pix(cropped_pix)
+
+    def clean_background_to_white(
+            self, mask=None, grayscale=None, gamma=1.0, black=0, white=255):
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixCleanBackgroundToWhite(
+                self._pix,
+                mask or ffi.NULL,
+                grayscale or ffi.NULL,
+                gamma,
+                black,
+                white))
+
+    def gamma_trc(self, gamma=1.0, minval=0, maxval=255):
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixGammaTRC(
+                ffi.NULL,
+                self._pix,
+                gamma,
+                minval,
+                maxval
+                ))
+
+    def background_norm(
+            self, mask=None, grayscale=None, tile_size=(10, 15), fg_threshold=60,
+            min_count=40, bg_val=200, smooth_kernel=(2, 1)):
+        # Background norm doesn't work on color mapped Pix, so remove colormap
+        target_pix = self.remove_colormap(lept.REMOVE_CMAP_BASED_ON_SRC)
+        with _LeptonicaErrorTrap():
+            return Pix(lept.pixBackgroundNorm(
+                target_pix._pix,
+                mask or ffi.NULL,
+                grayscale or ffi.NULL,
+                tile_size[0],
+                tile_size[1],
+                fg_threshold,
+                min_count,
+                bg_val,
+                smooth_kernel[0],
+                smooth_kernel[1]
+            ))
+
+    @staticmethod
+    @lru_cache(maxsize=1)
+    def make_pixel_sum_tab8():
+        return lept.makePixelSumTab8()
+
+    @staticmethod
+    def correlation_binary(pix1, pix2):
+        if get_leptonica_version() < 'leptonica-1.72':
+            # Older versions of Leptonica (pre-1.72) have a buggy
+            # implementation of pixCorrelationBinary that overflows on larger
+            # images.  Ubuntu 14.04/trusty has 1.70. Ubuntu PPA
+            # ppa:alex-p/tesseract-ocr has leptonlib 1.75.
+            raise LeptonicaError("Leptonica version is too old")
+
+        correlation = ffi.new('float *', 0.0)
+        result = lept.pixCorrelationBinary(pix1._pix, pix2._pix,
+                                           correlation)
+        if result != 0:
+            raise LeptonicaError("Correlation failed")
+        return correlation[0]
+
+    def generate_pdf_ci_data(self, type_, quality):
+        "Convert to PDF data, with transcoding"
+        p_compdata = ffi.new('L_COMP_DATA **')
+        result = lept.pixGenerateCIData(self._pix, type_, quality, 0,
+                                        p_compdata)
+        if result != 0:
+            raise LeptonicaError("Generate PDF data failed")
+        return CompressedData(p_compdata[0])
+
+    def invert(self):
+        return Pix(lept.pixInvert(ffi.NULL, self._pix))
+
+    @staticmethod
+    def _pix_destroy(pix):
+        p_pix = ffi.new('PIX **', pix)
+        lept.pixDestroy(p_pix)
+        # print('pix destroy ' + repr(pix))
+
+
+class CompressedData:
+    def __init__(self, compdata):
+        self._compdata = ffi.gc(compdata, CompressedData._destroy)
+
+    @classmethod
+    def open(cls, path, jpeg_quality=75):
+        "Open compressed data, without transcoding"
+        filename = fspath(path)
+
+        p_compdata = ffi.new('L_COMP_DATA **')
+        result = lept.l_generateCIDataForPdf(
+            os.fsencode(filename), ffi.NULL, jpeg_quality, p_compdata)
+        if result != 0:
+            raise LeptonicaError("CompressedData.open")
+        return CompressedData(p_compdata[0])
+
+    def __len__(self):
+        return self._compdata.nbytescomp
+
+    def read(self):
+        buf = ffi.buffer(self._compdata.datacomp, self._compdata.nbytescomp)
+        return bytes(buf)
+
+    def __getattr__(self, name):
+        if hasattr(self._compdata, name):
+            return getattr(self._compdata, name)
+        raise AttributeError(name)
+
+    def get_palette_pdf_string(self):
+        "Returns palette pre-formatted for use in PDF"
+        buflen = len('< ') + len(' rrggbb') * self._compdata.ncolors + len('>')
+        buf = ffi.buffer(self._compdata.cmapdatahex, buflen)
+        return bytes(buf)
+
+    @staticmethod
+    def _destroy(compdata):
+        pp = ffi.new('L_COMP_DATA **', compdata)
+        lept.l_CIDataDestroy(pp)
+
+
+class Box:
+    """Wrapper around Leptonica's BOX objects.
+
+    See class Pix for notes about reference counting.
+    """
+
+    def __init__(self, box):
+        self._box = ffi.gc(box, Box._box_destroy)
+
+    def __repr__(self):
+        if self._box:
+            return '<leptonica.Box x={0} y={1} w={2} h={3}>'.format(
+                self.x, self.y, self.w, self.h)
+        return '<leptonica.Box NULL>'
+
+    @property
+    def x(self):
+        return self._box.x
+
+    @property
+    def y(self):
+        return self._box.y
+
+    @property
+    def w(self):
+        return self._box.w
+
+    @property
+    def h(self):
+        return self._box.h
+
+    @staticmethod
+    def _box_destroy(box):
+        p_box = ffi.new('BOX **', box)
+        lept.boxDestroy(p_box)
+
+
+@lru_cache(maxsize=1)
+def get_leptonica_version():
+    """Get Leptonica version string.
+
+    Caveat: Leptonica expects the caller to free this memory.  We don't,
+    since that would involve binding to libc to access libc.free(),
+    a pointless effort to reclaim 100 bytes of memory.
+    """
+    return ffi.string(lept.getLeptonicaVersion()).decode()
+
+
+def deskew(infile, outfile, dpi):
+    try:
+        pix_source = Pix.open(infile)
+    except LeptonicaIOError:
+        raise LeptonicaIOError("Failed to open file: %s" % infile)
+
+    if dpi < 150:
+        reduction_factor = 1  # Don't downsample too much if DPI is already low
+    else:
+        reduction_factor = 0  # Use default
+    pix_deskewed = pix_source.deskew(reduction_factor)
+
+    try:
+        pix_deskewed.write_implied_format(outfile)
+    except LeptonicaIOError:
+        raise LeptonicaIOError("Failed to open destination file: %s" % outfile)
+
+
+def remove_background(infile, outfile, tile_size=(40, 60), gamma=1.0,
+                      black_threshold=70, white_threshold=190):
+    try:
+        pix = Pix.open(infile)
+    except LeptonicaIOError:
+        raise LeptonicaIOError("Failed to open file: %s" % infile)
+
+    pix = pix.background_norm(tile_size=tile_size).gamma_trc(
+            gamma, black_threshold, white_threshold)
+
+    try:
+        pix.write_implied_format(outfile)
+    except LeptonicaIOError:
+        raise LeptonicaIOError("Failed to open destination file: %s" % outfile)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description="Python wrapper to access Leptonica")
+
+    subparsers = parser.add_subparsers(title='commands',
+                                       description='supported operations')
+
+    parser_deskew = subparsers.add_parser('deskew')
+    parser_deskew.add_argument('-r', '--dpi', dest='dpi', action='store',
+                               type=int, default=300, help='input resolution')
+    parser_deskew.add_argument('infile', help='image to deskew')
+    parser_deskew.add_argument('outfile', help='deskewed output image')
+    parser_deskew.set_defaults(func=deskew)
+
+    args = parser.parse_args()
+    args.func(args)

src/ocrmypdf/lib/__init__.py

@@ -0,0 +1,18 @@
+# © 2017 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Bindings to external libraries"""

src/ocrmypdf/lib/_leptonica.py

@@ -0,0 +1,11 @@
+# auto-generated file
+import _cffi_backend
+
+ffi = _cffi_backend.FFI('ocrmypdf.lib._leptonica',
+    _version = 0x2601,
+    _types = b'\x00\x00\x0F\x0D\x00\x00\xCD\x03\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\xD0\x03\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\xCA\x03\x00\x00\x0F\x03\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x0D\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x0D\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x0D\x01\x00\x00\x02\x03\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x0D\x01\x00\x00\x0D\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\x08\x11\x00\x00\x00\x0F\x00\x00\x01\x0D\x00\x00\xDC\x03\x00\x00\x1C\x01\x00\x00\x00\x0F\x00\x00\xCF\x0D\x00\x00\x00\x0F\x00\x00\x49\x0D\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x1F\x03\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x6E\x11\x00\x00\x6E\x11\x00\x00\x6E\x11\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x6E\x11\x00\x00\x6E\x11\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x49\x11\x00\x00\x49\x11\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x0D\x01\x00\x00\x07\x01\x00\x00\x49\x11\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\xCB\x03\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x6E\x11\x00\x00\x6E\x11\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x0D\x01\x00\x00\x01\x03\x00\x00\xA4\x11\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x01\x11\x00\x00\xDB\x03\x00\x00\x65\x03\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x08\x11\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x92\x11\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\x08\x11\x00\x00\x01\x11\x00\x00\x07\x01\x00\x00\x07\x01\x00\x00\x00\x0F\x00\x00\x02\x0D\x00\x00\xD9\x03\x00\x00\xAA\x11\x00\x00\x01\x11\x00\x00\x0D\x01\x00\x00\x00\x0F\x00\x00\xDF\x0D\x00\x00\x10\x11\x00\x00\x00\x0F\x00\x00\xDF\x0D\x00\x00\x92\x11\x00\x00\x00\x0F\x00\x00\xDF\x0D\x00\x00\xA4\x11\x00\x00\x00\x0F\x00\x00\xDF\x0D\x00\x00\xDF\x03\x00\x00\x00\x0F\x00\x00\x00\x09\x00\x00\xCC\x03\x00\x00\x01\x09\x00\x00\x02\x09\x00\x00\x03\x09\x00\x00\xD0\x03\x00\x00\x02\x01\x00\x00\x0E\x01\x00\x00\x00\x0B\x00\x00\x01\x0B\x00\x00\x02\x0B\x00\x00\x0B\x01\x00\x00\x05\x01\x00\x00\x03\x01\x00\x00\xCE\x03\x00\x00\xDA\x03\x00\x00\x04\x01\x00\x00\xDC\x03\x00\x00\x08\x01\x00\x00\x0C\x01\x00\x00\x06\x01\x00\x00\x00\x01',
+    _globals = (b'\xFF\xFF\xFF\x0BL_CLONE',2,b'\xFF\xFF\xFF\x0BL_COPY',1,b'\xFF\xFF\xFF\x0BL_COPY_CLONE',3,b'\xFF\xFF\xFF\x0BL_DEFAULT_ENCODE',0,b'\xFF\xFF\xFF\x0BL_FLATE_ENCODE',3,b'\xFF\xFF\xFF\x0BL_G4_ENCODE',2,b'\xFF\xFF\xFF\x0BL_INSERT',0,b'\xFF\xFF\xFF\x0BL_JP2K_ENCODE',4,b'\xFF\xFF\xFF\x0BL_JPEG_ENCODE',1,b'\xFF\xFF\xFF\x0BL_NOCOPY',0,b'\xFF\xFF\xFF\x0BREMOVE_CMAP_BASED_ON_SRC',4,b'\xFF\xFF\xFF\x0BREMOVE_CMAP_TO_BINARY',0,b'\xFF\xFF\xFF\x0BREMOVE_CMAP_TO_FULL_COLOR',2,b'\xFF\xFF\xFF\x0BREMOVE_CMAP_TO_GRAYSCALE',1,b'\xFF\xFF\xFF\x0BREMOVE_CMAP_WITH_ALPHA',3,b'\x00\x00\xBE\x23boxDestroy',0,b'\x00\x00\x67\x23getLeptonicaVersion',0,b'\x00\x00\xC1\x23l_CIDataDestroy',0,b'\x00\x00\xAC\x23l_generateCIDataForPdf',0,b'\x00\x00\xC7\x23lept_free',0,b'\x00\x00\x69\x23makePixelSumTab8',0,b'\x00\x00\x16\x23pixAnd',0,b'\x00\x00\x23\x23pixBackgroundNorm',0,b'\x00\x00\x1B\x23pixCleanBackgroundToWhite',0,b'\x00\x00\x0D\x23pixClipRectangle',0,b'\x00\x00\x94\x23pixColorFraction',0,b'\x00\x00\x59\x23pixColorMagnitude',0,b'\x00\x00\x0A\x23pixConvertRGBToLuminance',0,b'\x00\x00\x6B\x23pixCorrelationBinary',0,b'\x00\x00\x80\x23pixCountPixels',0,b'\x00\x00\x63\x23pixDeserializeFromMemory',0,b'\x00\x00\x50\x23pixDeskew',0,b'\x00\x00\xC4\x23pixDestroy',0,b'\x00\x00\x0A\x23pixEndianByteSwapNew',0,b'\x00\x00\x00\x23pixFindPageForeground',0,b'\x00\x00\x7B\x23pixFindSkew',0,b'\x00\x00\x2F\x23pixGammaTRC',0,b'\x00\x00\x8D\x23pixGenerateCIData',0,b'\x00\x00\x70\x23pixGetAverageMaskedRGB',0,b'\x00\x00\x36\x23pixGlobalNormRGB',0,b'\x00\x00\x12\x23pixInvert',0,b'\x00\x00\x54\x23pixMaskOverColorPixels',0,b'\x00\x00\x85\x23pixNumSignificantGrayColors',0,b'\x00\x00\x9D\x23pixOtsuAdaptiveThreshold',0,b'\x00\x00\x3E\x23pixOtsuThreshOnBackgroundNorm',0,b'\x00\x00\x60\x23pixRead',0,b'\x00\x00\x50\x23pixRemoveColormap',0,b'\x00\x00\x54\x23pixRemoveColormapGeneral',0,b'\x00\x00\x12\x23pixRotate180',0,b'\x00\x00\x50\x23pixRotateOrth',0,b'\x00\x00\x4B\x23pixScale',0,b'\x00\x00\xA7\x23pixSerializeToMemory',0,b'\x00\x00\xB2\x23pixWriteImpliedFormat',0,b'\x00\x00\xB8\x23pixWriteMemPng',0),
+    _struct_unions = ((b'\x00\x00\x00\xCA\x00\x00\x00\x02Box',b'\x00\x00\x02\x11x',b'\x00\x00\x02\x11y',b'\x00\x00\x02\x11w',b'\x00\x00\x02\x11h',b'\x00\x00\xDC\x11refcount'),(b'\x00\x00\x00\xCC\x00\x00\x00\x02L_Compressed_Data',b'\x00\x00\x02\x11type',b'\x00\x00\xD9\x11datacomp',b'\x00\x00\x65\x11nbytescomp',b'\x00\x00\xCF\x11data85',b'\x00\x00\x65\x11nbytes85',b'\x00\x00\xCF\x11cmapdata85',b'\x00\x00\xCF\x11cmapdatahex',b'\x00\x00\x02\x11ncolors',b'\x00\x00\x02\x11w',b'\x00\x00\x02\x11h',b'\x00\x00\x02\x11bps',b'\x00\x00\x02\x11spp',b'\x00\x00\x02\x11minisblack',b'\x00\x00\x02\x11predictor',b'\x00\x00\x65\x11nbytes',b'\x00\x00\x02\x11res'),(b'\x00\x00\x00\xCD\x00\x00\x00\x02Pix',b'\x00\x00\xDC\x11w',b'\x00\x00\xDC\x11h',b'\x00\x00\xDC\x11d',b'\x00\x00\xDC\x11spp',b'\x00\x00\xDC\x11wpl',b'\x00\x00\xDC\x11refcount',b'\x00\x00\x02\x11xres',b'\x00\x00\x02\x11yres',b'\x00\x00\x02\x11informat',b'\x00\x00\x02\x11special',b'\x00\x00\xCF\x11text',b'\x00\x00\xD8\x11colormap',b'\x00\x00\xDB\x11data'),(b'\x00\x00\x00\xCE\x00\x00\x00\x02PixColormap',b'\x00\x00\xC8\x11array',b'\x00\x00\x02\x11depth',b'\x00\x00\x02\x11nalloc',b'\x00\x00\x02\x11n')),
+    _enums = (b'\x00\x00\x00\xD2\x00\x00\x00\x16$1\x00L_DEFAULT_ENCODE,L_JPEG_ENCODE,L_G4_ENCODE,L_FLATE_ENCODE,L_JP2K_ENCODE',b'\x00\x00\x00\xD3\x00\x00\x00\x16$2\x00REMOVE_CMAP_TO_BINARY,REMOVE_CMAP_TO_GRAYSCALE,REMOVE_CMAP_TO_FULL_COLOR,REMOVE_CMAP_WITH_ALPHA,REMOVE_CMAP_BASED_ON_SRC',b'\x00\x00\x00\xD4\x00\x00\x00\x16$3\x00L_NOCOPY,L_INSERT,L_COPY,L_CLONE,L_COPY_CLONE'),
+    _typenames = (b'\x00\x00\x00\xCABOX',b'\x00\x00\x00\xCCL_COMP_DATA',b'\x00\x00\x00\xCDPIX',b'\x00\x00\x00\xCEPIXCMAP',b'\x00\x00\x00\x1Fl_float32',b'\x00\x00\x00\xD1l_float64',b'\x00\x00\x00\xD6l_int16',b'\x00\x00\x00\x02l_int32',b'\x00\x00\x00\xD5l_int64',b'\x00\x00\x00\xD7l_int8',b'\x00\x00\x00\xDEl_uint16',b'\x00\x00\x00\xDCl_uint32',b'\x00\x00\x00\xDDl_uint64',b'\x00\x00\x00\xDAl_uint8'),
+)

src/ocrmypdf/lib/compile_leptonica.py

@@ -0,0 +1,310 @@
+#!/usr/bin/env python3
+# © 2017 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from cffi import FFI
+
+ffibuilder = FFI()
+ffibuilder.set_source("ocrmypdf.lib._leptonica", None)
+ffibuilder.cdef("""
+typedef signed char             l_int8;
+typedef unsigned char           l_uint8;
+typedef short                   l_int16;
+typedef unsigned short          l_uint16;
+typedef int                     l_int32;
+typedef unsigned int            l_uint32;
+typedef float                   l_float32;
+typedef double                  l_float64;
+typedef long long               l_int64;
+typedef unsigned long long      l_uint64;
+
+struct Pix
+{
+    l_uint32             w;           /* width in pixels                   */
+    l_uint32             h;           /* height in pixels                  */
+    l_uint32             d;           /* depth in bits (bpp)               */
+    l_uint32             spp;         /* number of samples per pixel       */
+    l_uint32             wpl;         /* 32-bit words/line                 */
+    l_uint32             refcount;    /* reference count (1 if no clones)  */
+    l_int32              xres;        /* image res (ppi) in x direction    */
+                                      /* (use 0 if unknown)                */
+    l_int32              yres;        /* image res (ppi) in y direction    */
+                                      /* (use 0 if unknown)                */
+    l_int32              informat;    /* input file format, IFF_*          */
+    l_int32              special;     /* special instructions for I/O, etc */
+    char                *text;        /* text string associated with pix   */
+    struct PixColormap  *colormap;    /* colormap (may be null)            */
+    l_uint32            *data;        /* the image data                    */
+};
+typedef struct Pix PIX;
+
+struct PixColormap
+{
+    void            *array;     /* colormap table (array of RGBA_QUAD)     */
+    l_int32          depth;     /* of pix (1, 2, 4 or 8 bpp)               */
+    l_int32          nalloc;    /* number of color entries allocated       */
+    l_int32          n;         /* number of color entries used            */
+};
+typedef struct PixColormap  PIXCMAP;
+
+struct Box
+{
+    l_int32            x;
+    l_int32            y;
+    l_int32            w;
+    l_int32            h;
+    l_uint32           refcount;      /* reference count (1 if no clones)  */
+
+};
+typedef struct Box    BOX;
+
+
+/*! Pdf formatted encoding types */
+enum {
+    L_DEFAULT_ENCODE  = 0,  /*!< use default encoding based on image        */
+    L_JPEG_ENCODE     = 1,  /*!< use dct encoding: 8 and 32 bpp, no cmap    */
+    L_G4_ENCODE       = 2,  /*!< use ccitt g4 fax encoding: 1 bpp           */
+    L_FLATE_ENCODE    = 3,  /*!< use flate encoding: any depth, cmap ok     */
+    L_JP2K_ENCODE     = 4   /*!< use jp2k encoding: 8 and 32 bpp, no cmap   */
+};
+
+/*! Compressed image data */
+struct L_Compressed_Data
+{
+    l_int32            type;         /*!< encoding type: L_JPEG_ENCODE, etc   */
+    l_uint8           *datacomp;     /*!< gzipped raster data                 */
+    size_t             nbytescomp;   /*!< number of compressed bytes          */
+    char              *data85;       /*!< ascii85-encoded gzipped raster data */
+    size_t             nbytes85;     /*!< number of ascii85 encoded bytes     */
+    char              *cmapdata85;   /*!< ascii85-encoded uncompressed cmap   */
+    char              *cmapdatahex;  /*!< hex pdf array for the cmap          */
+    l_int32            ncolors;      /*!< number of colors in cmap            */
+    l_int32            w;            /*!< image width                         */
+    l_int32            h;            /*!< image height                        */
+    l_int32            bps;          /*!< bits/sample; typ. 1, 2, 4 or 8      */
+    l_int32            spp;          /*!< samples/pixel; typ. 1 or 3          */
+    l_int32            minisblack;   /*!< tiff g4 photometry                  */
+    l_int32            predictor;    /*!< flate data has PNG predictors       */
+    size_t             nbytes;       /*!< number of uncompressed raster bytes */
+    l_int32            res;          /*!< resolution (ppi)                    */
+};
+typedef struct L_Compressed_Data L_COMP_DATA;
+
+enum {
+    REMOVE_CMAP_TO_BINARY = 0,     /*!< remove colormap for conv to 1 bpp  */
+    REMOVE_CMAP_TO_GRAYSCALE = 1,  /*!< remove colormap for conv to 8 bpp  */
+    REMOVE_CMAP_TO_FULL_COLOR = 2, /*!< remove colormap for conv to 32 bpp */
+    REMOVE_CMAP_WITH_ALPHA = 3,    /*!< remove colormap and alpha          */
+    REMOVE_CMAP_BASED_ON_SRC = 4   /*!< remove depending on src format     */
+};
+
+/*! Access and storage flags */
+enum {
+    L_NOCOPY = 0,     /*!< do not copy the object; do not delete the ptr  */
+    L_INSERT = L_NOCOPY,    /*!< stuff it in; do not copy or clone        */
+    L_COPY = 1,       /*!< make/use a copy of the object                  */
+    L_CLONE = 2,      /*!< make/use clone (ref count) of the object       */
+    L_COPY_CLONE = 3  /*!< make a new array object (e.g., pixa) and fill  */
+                      /*!< the array with clones (e.g., pix)              */
+};
+
+""")
+
+ffibuilder.cdef("""
+PIX * pixRead ( const char *filename );
+PIX * pixScale ( PIX *pixs, l_float32 scalex, l_float32 scaley );
+l_int32 pixFindSkew ( PIX *pixs, l_float32 *pangle, l_float32 *pconf );
+l_int32 pixWriteImpliedFormat ( const char *filename, PIX *pix, l_int32 quality, l_int32 progressive );
+l_int32
+pixWriteMemPng(l_uint8  **pdata,
+               size_t    *psize,
+               PIX       *pix,
+               l_float32  gamma);
+
+void pixDestroy ( PIX **ppix );
+
+PIX *
+pixEndianByteSwapNew(PIX  *pixs);
+
+PIX * pixDeskew ( PIX *pixs, l_int32 redsearch );
+char * getLeptonicaVersion (  );
+l_int32 pixCorrelationBinary(PIX *pix1, PIX *pix2, l_float32 *pval);
+PIX *pixRotate180(PIX *pixd, PIX *pixs);
+PIX *
+pixRotateOrth(PIX     *pixs,
+              l_int32  quads);
+
+l_int32 pixCountPixels ( PIX *pix, l_int32 *pcount, l_int32 *tab8 );
+PIX * pixAnd ( PIX *pixd, PIX *pixs1, PIX *pixs2 );
+l_int32 * makePixelSumTab8 ( void );
+
+PIX * pixDeserializeFromMemory ( const l_uint32 *data, size_t nbytes );
+l_int32 pixSerializeToMemory ( PIX *pixs, l_uint32 **pdata, size_t *pnbytes );
+
+PIX * pixConvertRGBToLuminance(PIX *pixs);
+
+PIX * pixRemoveColormap(PIX *pixs, l_int32  type);
+
+l_int32
+pixOtsuAdaptiveThreshold(PIX       *pixs,
+                         l_int32    sx,
+                         l_int32    sy,
+                         l_int32    smoothx,
+                         l_int32    smoothy,
+                         l_float32  scorefract,
+                         PIX      **ppixth,
+                         PIX      **ppixd);
+
+PIX *
+pixOtsuThreshOnBackgroundNorm(PIX       *pixs,
+                              PIX       *pixim,
+                              l_int32    sx,
+                              l_int32    sy,
+                              l_int32    thresh,
+                              l_int32    mincount,
+                              l_int32    bgval,
+                              l_int32    smoothx,
+                              l_int32    smoothy,
+                              l_float32  scorefract,
+                              l_int32   *pthresh);
+
+PIX *
+pixCleanBackgroundToWhite(PIX       *pixs,
+                          PIX       *pixim,
+                          PIX       *pixg,
+                          l_float32  gamma,
+                          l_int32    blackval,
+                          l_int32    whiteval);
+
+BOX *
+pixFindPageForeground(PIX         *pixs,
+                      l_int32      threshold,
+                      l_int32      mindist,
+                      l_int32      erasedist,
+                      l_int32      pagenum,
+                      l_int32      showmorph,
+                      l_int32      display,
+                      const char  *pdfdir);
+
+PIX *
+pixClipRectangle(PIX   *pixs,
+                 BOX   *box,
+                 BOX  **pboxc);
+
+PIX *
+pixBackgroundNorm(PIX     *pixs,
+                  PIX     *pixim,
+                  PIX     *pixg,
+                  l_int32  sx,
+                  l_int32  sy,
+                  l_int32  thresh,
+                  l_int32  mincount,
+                  l_int32  bgval,
+                  l_int32  smoothx,
+                  l_int32  smoothy);
+
+PIX *
+pixGammaTRC(PIX       *pixd,
+            PIX       *pixs,
+            l_float32  gamma,
+            l_int32    minval,
+            l_int32    maxval);
+
+
+l_int32
+pixNumSignificantGrayColors(PIX       *pixs,
+                            l_int32    darkthresh,
+                            l_int32    lightthresh,
+                            l_float32  minfract,
+                            l_int32    factor,
+                            l_int32   *pncolors);
+
+l_int32
+pixColorFraction(PIX        *pixs,
+                 l_int32     darkthresh,
+                 l_int32     lightthresh,
+                 l_int32     diffthresh,
+                 l_int32     factor,
+                 l_float32  *ppixfract,
+                 l_float32  *pcolorfract);
+
+PIX *
+pixColorMagnitude(PIX     *pixs,
+                  l_int32  rwhite,
+                  l_int32  gwhite,
+                  l_int32  bwhite,
+                  l_int32  type);
+
+PIX *
+pixMaskOverColorPixels(PIX     *pixs,
+                       l_int32  threshdiff,
+                       l_int32  mindist);
+
+l_int32
+pixGetAverageMaskedRGB(PIX        *pixs,
+                       PIX        *pixm,
+                       l_int32     x,
+                       l_int32     y,
+                       l_int32     factor,
+                       l_int32     type,
+                       l_float32  *prval,
+                       l_float32  *pgval,
+                       l_float32  *pbval);
+
+PIX * 
+pixGlobalNormRGB(PIX * 	pixd,
+                 PIX * 	pixs,
+                 l_int32 	rval,
+                 l_int32 	gval,
+                 l_int32 	bval,
+                 l_int32 	mapval); 
+
+PIX *
+pixInvert(PIX * pixd,
+          PIX * pixs);
+
+PIX *
+pixRemoveColormapGeneral(PIX     *pixs,
+                         l_int32  type,
+                         l_int32  ifnocmap);
+
+l_int32
+pixGenerateCIData(PIX           *pixs,
+                  l_int32        type,
+                  l_int32        quality,
+                  l_int32        ascii85,
+                  L_COMP_DATA **pcid);
+
+l_int32 
+l_generateCIDataForPdf(const char *fname, 
+                       PIX *pix, 
+                       l_int32 quality, 
+                       L_COMP_DATA **pcid);
+
+void                 
+boxDestroy(BOX  **pbox);
+
+void
+l_CIDataDestroy(L_COMP_DATA **pcid);
+
+void
+lept_free(void *ptr);  
+""")
+
+
+if __name__ == '__main__':
+    ffibuilder.compile(verbose=True)

src/ocrmypdf/optimize.py

@@ -0,0 +1,485 @@
+# © 2018 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from pathlib import Path
+import concurrent.futures
+from collections import defaultdict, namedtuple
+import logging
+import sys
+
+from PIL import Image
+
+import pikepdf
+
+from ._jobcontext import JobContext
+from . import leptonica
+from .helpers import re_symlink, fspath
+from .exec import pngquant, jbig2enc
+
+DEFAULT_JPEG_QUALITY = 75
+DEFAULT_PNG_QUALITY = 70
+
+
+def img_name(root, xref, ext):
+    return fspath(root / '{:08d}{}'.format(xref, ext))
+
+
+def png_name(root, xref):
+    return img_name(root, xref, '.png')
+
+
+def jpg_name(root, xref):
+    return img_name(root, xref, '.jpg')
+
+
+def tif_name(root, xref):
+    return img_name(root, xref, '.tif')
+
+
+def extract_image_filter(pike, root, log, image, xref):
+    if image.Subtype != '/Image':
+        return None
+    if image.Length < 100:
+        log.debug("Skipping small image, xref %s", xref)
+        return None
+
+    pim = pikepdf.PdfImage(image)
+
+    if len(pim.filter_decodeparms) > 1:
+        log.debug("Skipping multiply filtered, xref %s", xref)
+        return None
+    filtdp = pim.filter_decodeparms[0]
+
+    if pim.bits_per_component > 8:
+        return None  # Don't mess with wide gamut images
+
+    if filtdp[0] == '/JPXDecode':
+        return None  # Don't do JPEG2000
+
+    return pim, filtdp
+
+
+def extract_image_jbig2(*, pike, root, log, image, xref, options):
+    result = extract_image_filter(pike, root, log, image, xref)
+    if result is None:
+        return None
+    pim, filtdp = result
+
+    if pim.bits_per_component == 1 \
+            and filtdp != '/JBIG2Decode' \
+            and jbig2enc.available():
+        try:
+            imgname = Path(root / '{:08d}'.format(xref))
+            with imgname.open('wb') as f:
+                ext = pim.extract_to(stream=f)
+            imgname.rename(imgname.with_suffix(ext))
+        except pikepdf.UnsupportedImageTypeError:
+            return None
+        return xref, ext
+    return None
+
+
+def extract_image_generic(*, pike, root, log, image, xref, options):
+    result = extract_image_filter(pike, root, log, image, xref)
+    if result is None:
+        return None
+    pim, filtdp = result
+
+    if filtdp[0] == '/DCTDecode' \
+            and options.optimize >= 2:
+        # This is a simple heuristic derived from some training data, that has
+        # about a 70% chance of guessing whether the JPEG is high quality,
+        # and possibly recompressible, or not. The number itself doesn't mean
+        # anything.
+        # bytes_per_pixel = int(raw_jpeg.Length) / (w * h)
+        # jpeg_quality_estimate = 117.0 * (bytes_per_pixel ** 0.213)
+        # if jpeg_quality_estimate < 65:
+        #     return None
+
+        # We could get the ICC profile here, but there's no need to look at it
+        # for quality transcoding
+        # if icc:
+        #     stream = BytesIO(raw_jpeg.read_raw_bytes())
+        #     iccbytes = icc.read_bytes()
+        #     with Image.open(stream) as im:
+        #         im.save(jpg_name(root, xref), icc_profile=iccbytes)
+        try:
+            imgname = Path(root / '{:08d}'.format(xref))
+            with imgname.open('wb') as f:
+                ext = pim.extract_to(stream=f)
+            imgname.rename(imgname.with_suffix(ext))
+        except pikepdf.UnsupportedImageTypeError:
+            return None
+        return xref, ext
+    elif pim.indexed \
+            and pim.colorspace in pim.SIMPLE_COLORSPACES \
+            and options.optimize >= 3:
+        # Try to improve on indexed images - these are far from low hanging
+        # fruit in most cases
+        pim.as_pil_image().save(png_name(root, xref))
+        return xref, '.png'
+    elif not pim.indexed and pim.colorspace in pim.SIMPLE_COLORSPACES:
+        # An optimization opportunity here, not currently taken, is directly
+        # generating a PNG from compressed data
+        pim.as_pil_image().save(png_name(root, xref))
+        return xref, '.png'
+    else:
+        return None
+
+    return True
+
+
+def extract_images(pike, root, log, options, extract_fn):
+    """Extract image using extract_fn
+
+    extract_fn decides where the image is interesting in this case
+    """
+
+    include_xrefs = set()
+    exclude_xrefs = set()
+    errors = 0
+    for pageno, page in enumerate(pike.pages):
+        try:
+            xobjs = page.Resources.XObject
+        except AttributeError:
+            continue
+        for _imname, image in dict(xobjs).items():
+            if image.objgen[1] != 0:
+                continue  # Ignore images in an incremental PDF
+            xref = image.objgen[0]
+            if hasattr(image, 'SMask'):
+                # Ignore soft masks
+                smask_xref = image.SMask.objgen[0]
+                exclude_xrefs.add(smask_xref)
+            include_xrefs.add(xref)
+
+    working_xrefs = include_xrefs - exclude_xrefs
+    for xref in working_xrefs:
+        image = pike.get_object((xref, 0))
+        try:
+            result = extract_fn(
+                pike=pike, root=root, log=log, image=image,
+                xref=xref, options=options
+            )
+        except Exception as e:
+            log.debug("Image xref %s", xref)
+            log.debug(repr(e))
+            errors += 1
+        else:
+            if result:
+                _, ext = result
+                yield pageno, xref, ext
+
+
+def extract_images_generic(pike, root, log, options):
+    """Extract any >=2bpp image we think we can improve"""
+
+    jpegs = []
+    pngs = []
+    for _, xref, ext in extract_images(
+            pike, root, log, options, extract_image_generic):
+        log.debug('xref = %s ext = %s', xref, ext)
+        if ext == '.png':
+            pngs.append(xref)
+        elif ext == '.jpg':
+            jpegs.append(xref)
+    log.debug(
+        "Optimizable images: "
+        "JPEGs: %s PNGs: %s", len(jpegs), len(pngs)
+    )
+    return jpegs, pngs
+
+
+def extract_images_jbig2(pike, root, log, options):
+    """Extract any bitonal image that we think we can improve as JBIG2"""
+
+    jbig2_groups = defaultdict(list)
+    for pageno, xref, ext in extract_images(
+            pike, root, log, options, extract_image_jbig2):
+        group = pageno // options.jbig2_page_group_size
+        jbig2_groups[group].append((xref, ext))
+
+    # Elide empty groups
+    jbig2_groups = {group: xrefs for group, xrefs in jbig2_groups.items()
+                    if len(xrefs) > 0}
+    log.debug(
+        "Optimizable images: "
+        "JBIG2 groups: %s", (len(jbig2_groups),)
+    )
+    return jbig2_groups
+
+
+def _produce_jbig2_images(jbig2_groups, root, log, options):
+    """Produce JBIG2 images from their groups"""
+
+    def jbig2_group_futures(executor, root, groups):
+        for group, xref_exts in groups.items():
+            prefix = 'group{:08d}'.format(group)
+            future = executor.submit(
+                jbig2enc.convert_group,
+                cwd=fspath(root),
+                infiles=(img_name(root, xref, ext) for xref, ext in xref_exts),
+                out_prefix=prefix
+            )
+            yield future
+
+    def jbig2_single_futures(executor, root, groups):
+        for group, xref_exts in groups.items():
+            prefix = 'group{:08d}'.format(group)
+            # Second loop is to ensure multiple images per page are unpacked
+            for n, xref_ext in enumerate(xref_exts):
+                xref, ext = xref_ext
+                future = executor.submit(
+                    jbig2enc.convert_single,
+                    cwd=fspath(root),
+                    infile=img_name(root, xref, ext),
+                    outfile=root / ('{}.{:04d}'.format(prefix, n))
+                )
+                yield future
+
+    if options.jbig2_page_group_size > 1:
+        jbig2_futures = jbig2_group_futures
+    else:
+        jbig2_futures = jbig2_single_futures
+
+    with concurrent.futures.ThreadPoolExecutor(
+            max_workers=options.jobs) as executor:
+        futures = jbig2_futures(executor, root, jbig2_groups)
+        for future in concurrent.futures.as_completed(futures):
+            proc = future.result()
+            log.debug(proc.stderr.decode())
+
+
+def convert_to_jbig2(pike, jbig2_groups, root, log, options):
+    """Convert images to JBIG2 and insert into PDF.
+
+    When the JBIG2 page group size is > 1 we do several JBIG2 images at once
+    and build a symbol dictionary that will span several pages. Each JBIG2
+    image must reference to its symbol dictionary. If too many pages shared the
+    same dictionary JBIG2 encoding becomes more expensive and less efficient.
+    The default value of 10 was determined through testing. Currently this
+    must be lossy encoding since jbig2enc does not support refinement coding.
+
+    When the JBIG2 symbolic coder is not used, each JBIG2 stands on its own
+    and needs no dictionary. Currently this is must be lossless JBIG2.
+    """
+
+    _produce_jbig2_images(jbig2_groups, root, log, options)
+
+    for group, xref_exts in jbig2_groups.items():
+        prefix = 'group{:08d}'.format(group)
+        jbig2_symfile = root / (prefix + '.sym')
+        if jbig2_symfile.exists():
+            jbig2_globals_data = jbig2_symfile.read_bytes()
+            jbig2_globals = pikepdf.Stream(pike, jbig2_globals_data)
+            jbig2_globals_dict = pikepdf.Dictionary({
+                    '/JBIG2Globals': jbig2_globals
+            })
+        elif options.jbig2_page_group_size == 1:
+            jbig2_globals_dict = None
+        else:
+            raise FileNotFoundError(jbig2_symfile)
+
+        for n, xref_ext in enumerate(xref_exts):
+            xref, _ = xref_ext
+            jbig2_im_file = root / (prefix + '.{:04d}'.format(n))
+            jbig2_im_data = jbig2_im_file.read_bytes()
+            im_obj = pike.get_object(xref, 0)
+            im_obj.write(
+                jbig2_im_data, pikepdf.Name('/JBIG2Decode'),
+                jbig2_globals_dict
+            )
+
+
+def transcode_jpegs(pike, jpegs, root, log, options):
+    for xref in jpegs:
+        in_jpg = Path(jpg_name(root, xref))
+        opt_jpg = in_jpg.with_suffix('.opt.jpg')
+
+        # This produces a debug warning from PIL
+        # DEBUG:PIL.Image:Error closing: 'NoneType' object has no attribute
+        # 'close'.  Seems to be mostly harmless
+        # https://github.com/python-pillow/Pillow/issues/1144
+        with Image.open(fspath(in_jpg)) as im:
+            im.save(fspath(opt_jpg),
+                    optimize=True,
+                    quality=options.jpeg_quality)
+        # pylint: disable=no-member
+        if opt_jpg.stat().st_size > in_jpg.stat().st_size:
+            log.debug("xref %s, jpeg, made larger - skip", xref)
+            continue
+
+        compdata = leptonica.CompressedData.open(opt_jpg)
+        im_obj = pike.get_object(xref, 0)
+        im_obj.write(
+            compdata.read(), filter=pikepdf.Name('/DCTDecode')
+        )
+
+
+def transcode_pngs(pike, pngs, root, log, options):
+    if options.optimize >= 2:
+        png_quality = (
+            max(10, options.png_quality - 10),
+            min(100, options.png_quality + 10)
+        )
+        with concurrent.futures.ThreadPoolExecutor(
+                max_workers=options.jobs) as executor:
+            for xref in pngs:
+                executor.submit(
+                    pngquant.quantize,
+                    png_name(root, xref), png_name(root, xref),
+                    png_quality[0], png_quality[1])
+
+    for xref in pngs:
+        im_obj = pike.get_object(xref, 0)
+
+        # Open, transcode (!), package for PDF
+        try:
+            pix = leptonica.Pix.open(png_name(root, xref))
+            if pix.depth == 1:
+                pix = pix.invert()  # PDF assumes 1 is black for monochrome
+            compdata = pix.generate_pdf_ci_data(
+                leptonica.lept.L_FLATE_ENCODE, 0
+            )
+        except leptonica.LeptonicaError as e:
+            log.error(e)
+            continue
+
+        # This is what we should be doing: open the compressed data without
+        # transcoding. However this shifts each pixel row by one for some
+        # reason.
+        #compdata = leptonica.CompressedData.open(png_name(root, xref))
+        if len(compdata) > int(im_obj.stream_dict.Length):
+            continue  # If we produced a larger image, don't use
+
+        predictor = None
+        if compdata.predictor > 0:
+            predictor = pikepdf.Dictionary({'/Predictor': compdata.predictor})
+
+        im_obj.BitsPerComponent = compdata.bps
+        im_obj.Width = compdata.w
+        im_obj.Height = compdata.h
+
+        if compdata.ncolors > 0:
+            palette_pdf_string = compdata.get_palette_pdf_string()
+            palette_data = pikepdf.Object.parse(palette_pdf_string)
+            palette_stream = pikepdf.Stream(pike, bytes(palette_data))
+            palette = [pikepdf.Name('/Indexed'), pikepdf.Name('/DeviceRGB'),
+                       compdata.ncolors - 1, palette_stream]
+            cs = palette
+        else:
+            if compdata.spp == 1:
+                cs = pikepdf.Name('/DeviceGray')
+            elif compdata.spp == 3:
+                cs = pikepdf.Name('/DeviceRGB')
+            elif compdata.spp == 4:
+                cs = pikepdf.Name('/DeviceCMYK')
+        im_obj.ColorSpace = cs
+        im_obj.write(
+            compdata.read(),
+            filter=pikepdf.Name('/FlateDecode'), decode_parms=predictor
+        )
+
+
+def optimize(
+    input_file,
+    output_file,
+    log,
+    context):
+
+    options = context.get_options()
+    if options.optimize == 0:
+        re_symlink(input_file, output_file, log)
+        return
+
+    if options.jpeg_quality == 0:
+        options.jpeg_quality = \
+                DEFAULT_JPEG_QUALITY if options.optimize < 3 else 40
+    if options.png_quality == 0:
+        options.png_quality = \
+                DEFAULT_PNG_QUALITY if options.optimize < 3 else 30
+    if options.jbig2_page_group_size == 0:
+        options.jbig2_page_group_size = \
+                10 if options.jbig2_lossy else 1
+
+    pike = pikepdf.Pdf.open(input_file)
+
+    root = Path(output_file).parent / 'images'
+    root.mkdir(exist_ok=True)  # pylint: disable=no-member
+
+    jpegs, pngs = extract_images_generic(pike, root, log, options)
+    transcode_jpegs(pike, jpegs, root, log, options)
+    transcode_pngs(pike, pngs, root, log, options)
+
+    jbig2_groups = extract_images_jbig2(pike, root, log, options)
+    convert_to_jbig2(pike, jbig2_groups, root, log, options)
+
+    target_file = Path(output_file).with_suffix('.opt.pdf')
+    pike.save(target_file, preserve_pdfa=True,
+              object_stream_mode=pikepdf.ObjectStreamMode.generate)
+
+    input_size = Path(input_file).stat().st_size
+    output_size = Path(target_file).stat().st_size
+    ratio = input_size / output_size
+    savings = 1 - output_size / input_size
+    log.info("Optimize ratio: {:.2f} savings: {:.1f}%".format(
+        ratio, 100 * savings))
+
+    if savings < 0:
+        log.info("Optimize did not improve the file - discarded")
+        re_symlink(input_file, output_file, log)
+    else:
+        re_symlink(target_file, output_file, log)
+
+
+def main(infile, outfile, level, jobs=1):
+    from tempfile import TemporaryDirectory
+    from shutil import copy
+
+    class OptimizeOptions:
+        """Emulate ocrmypdf's options"""
+
+        def __init__(
+                self, jobs, optimize, jpeg_quality, png_quality, jb2lossy):
+            self.jobs = jobs
+            self.optimize = optimize
+            self.jpeg_quality = jpeg_quality
+            self.png_quality = png_quality
+            self.jbig2_page_group_size = 0
+            self.jbig2_lossy = jb2lossy
+
+    logging.basicConfig(level=logging.DEBUG)
+    log = logging.getLogger()
+
+    ctx = JobContext()
+    options = OptimizeOptions(
+        jobs=jobs,
+        optimize=int(level),
+        jpeg_quality=0,  # Use default
+        png_quality=0,
+        jb2lossy=False
+    )
+    ctx.set_options(options)
+
+    with TemporaryDirectory() as td:
+        tmpout = Path(td) / 'out.pdf'
+        optimize(infile, tmpout, log, ctx)
+        copy(fspath(tmpout), fspath(outfile))
+
+
+if __name__ == '__main__':
+    main(sys.argv[1], sys.argv[2], sys.argv[3])

src/ocrmypdf/pdfa.py

@@ -0,0 +1,335 @@
+# © 2015 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Generate a PDFMARK file for Ghostscript >= 9.14, for PDF/A conversion
+
+pdfmark is an extension to the Postscript language that describes some PDF
+features like bookmarks and annotations. It was originally specified Adobe
+Distiller, for Postscript to PDF conversion:
+https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/pdfmark_reference.pdf
+
+Ghostscript uses pdfmark for PDF to PDF/A conversion as well. To use Ghostscript
+to create a PDF/A, we need to create a pdfmark file with the necessary metadata.
+
+This takes care of the many version-specific bugs and pecularities in
+Ghostscript's handling of pdfmark.
+
+"""
+
+from binascii import hexlify
+from datetime import datetime
+from pathlib import Path
+from shutil import copyfile
+from string import Template
+import pkg_resources
+import os
+
+from libxmp.utils import file_to_dict
+from libxmp import consts
+
+from ocrmypdf.helpers import fspath
+
+ICC_PROFILE_RELPATH = 'data/sRGB.icc'
+
+SRGB_ICC_PROFILE = pkg_resources.resource_filename(
+    'ocrmypdf', ICC_PROFILE_RELPATH)
+
+
+# This is a template written in PostScript which is needed to create PDF/A
+# files, from the Ghostscript documentation. Lines beginning with % are
+# comments. Python substitution variables have a '$' prefix.
+pdfa_def_template = u"""%!
+% Define entries in the document Info dictionary :
+/ICCProfile $icc_profile
+def
+
+[$docinfo
+  /DOCINFO pdfmark
+
+% Define an ICC profile :
+
+[/_objdef {icc_PDFA} /type /stream /OBJ pdfmark
+[{icc_PDFA}
+<<
+  /N currentpagedevice /ProcessColorModel known {
+    currentpagedevice /ProcessColorModel get dup /DeviceGray eq
+    {pop 1} {
+      /DeviceRGB eq
+      {3}{4} ifelse
+    } ifelse
+  } {
+    (ERROR, unable to determine ProcessColorModel) == flush
+  } ifelse
+>> /PUT pdfmark
+[{icc_PDFA} ICCProfile (r) file /PUT pdfmark
+
+% Define the output intent dictionary :
+
+[/_objdef {OutputIntent_PDFA} /type /dict /OBJ pdfmark
+[{OutputIntent_PDFA} <<
+  /Type /OutputIntent             % Must be so (the standard requires).
+  /S /GTS_PDFA1                   % Must be so (the standard requires).
+  /DestOutputProfile {icc_PDFA}            % Must be so (see above).
+  /OutputConditionIdentifier ($icc_identifier)
+>> /PUT pdfmark
+[{Catalog} <</OutputIntents [ {OutputIntent_PDFA} ]>> /PUT pdfmark
+"""
+
+
+def encode_text_string(s: str) -> str:
+    """
+    Encode text string to hex string for use in a PDF
+
+    From PDF 32000-1:2008 a string object may be included in hexademical form
+    if it is enclosed in angle brackets.  For general Unicode the string should
+    be UTF-16 (big endian) with byte order marks.  Many strings including all
+    ASCII strings could be encoded as PdfDocEncoding literals provided
+    that certain Postscript sequences are escaped.  But it's far simpler to
+    encode everything as UTF-16.
+    """
+
+    # Sometimes lazy C programmers leave their NULs at the end of strings they
+    # insert into PDFs
+    # tests/resources/aspect.pdf is one example (created by ImageMagick)
+    s = s.replace('\x00', '')
+
+    if s == '':
+        return ''
+
+    utf16_bytes = s.encode('utf-16be')
+    ascii_hex_bytes = hexlify(b'\xfe\xff' + utf16_bytes)
+    ascii_hex_str = ascii_hex_bytes.decode('ascii').lower()
+    return ascii_hex_str
+
+
+def _encode_ascii(s: str) -> str:
+    """
+    Aggressively strip non-ASCII and PDF escape sequences
+
+    Ghostscript 9.24+ lost support for UTF-16BE in pdfmark files for reasons
+    given in GhostPDL commit e997c683. Our temporary workaround is use ASCII
+    and drop all non-ASCII characters. A slightly improved alternative would
+    be to implement PdfDocEncoding in pikepdf and encode to that, or handle
+    metadata there.
+    """
+    trans = str.maketrans({
+        '(': '',
+        ')': '',
+        '\\': '',
+        '\0': ''
+    })
+    return s.translate(trans).encode('ascii', errors='replace').decode()
+
+
+def encode_pdf_date(d: datetime) -> str:
+    """
+    Encode Python datetime object as PDF date string
+
+    From Adobe pdfmark manual:
+    (D:YYYYMMDDHHmmSSOHH'mm')
+    D: is an optional prefix. YYYY is the year. All fields after the year are
+    optional. MM is the month (01-12), DD is the day (01-31), HH is the
+    hour (00-23), mm are the minutes (00-59), and SS are the seconds
+    (00-59). The remainder of the string defines the relation of local
+    time to GMT. O is either + for a positive difference (local time is
+    later than GMT) or - (minus) for a negative difference. HH' is the
+    absolute value of the offset from GMT in hours, and mm' is the
+    absolute value of the offset in minutes. If no GMT information is
+    specified, the relation between the specified time and GMT is
+    considered unknown. Regardless of whether or not GMT
+    information is specified, the remainder of the string should specify
+    the local time.
+    """
+
+    pdfmark_date_fmt = r'%Y%m%d%H%M%S'
+    s = d.strftime(pdfmark_date_fmt)
+
+    tz = d.strftime('%z')
+    if tz == 'Z' or tz == '':
+        # Ghostscript <= 9.23 handles missing timezones incorrectly, so if
+        # timezone is missing, move it into GMT.
+        # https://bugs.ghostscript.com/show_bug.cgi?id=699182
+        s += "+00'00'"
+    else:
+        sign, tz_hours, tz_mins = tz[0], tz[1:3], tz[3:5]
+        s += "{}{}'{}'".format(sign, tz_hours, tz_mins)
+    return s
+
+
+def decode_pdf_date(s: str) -> datetime:
+    """
+    Decode a pdfmark date to a Python datetime object
+
+    A pdfmark date is a string in a paritcular format. See the pdfmark
+    Reference for the specification.
+
+    """
+    if s.startswith('D:'):
+        s = s[2:]
+
+    # Literal Z00'00', is incorrect but found in the wild,
+    # probably made by OS X Quartz -- standardize
+    if s.endswith("Z00'00'"):
+        s = s.replace("Z00'00'", '+0000')
+    elif s.endswith('Z'):
+        s = s.replace('Z', '+0000')
+
+    s = s.replace("'", "")  # Remove apos from PDF time strings
+
+    return datetime.strptime(s, r'%Y%m%d%H%M%S%z')
+
+
+def _get_pdfmark_dates(pdfmark):
+    """
+    Encode dates in the expected format for pdfmark Postscript
+
+    The best way to deal with amissing date entry is set it to null, because if
+    the key is omitted Ghostscript will set it to now - we do not want to erase
+    the fact that the value was unknown.  Setting to an empty string breaks
+    Ghostscript 9.22 as reported here:
+    https://bugs.ghostscript.com/show_bug.cgi?id=699182
+    """
+
+    for key in ('/CreationDate', '/ModDate'):
+        if key not in pdfmark:
+            continue
+        if pdfmark[key].strip() == '':
+            yield '  {} null'.format(key)
+            continue
+        date_str = pdfmark[key]
+        if date_str.startswith('D:'):
+            date_str = date_str[2:]
+        try:
+            yield '  {} (D:{})'.format(
+                    key,
+                    encode_pdf_date(decode_pdf_date(date_str)))
+        except ValueError:
+            yield '  {} null'.format(key)
+
+
+def _get_pdfa_def(icc_profile, icc_identifier, pdfmark, ascii_docinfo=False):
+    """
+    Create a Postscript pdfmark file for Ghostscript.
+
+    pdfmark contains the various objects as strings; these must be encoded in
+    ASCII, and dates have a special format.
+
+    :param icc_profile: filename of the ICC profile to include in pdfmark
+    :param icc_identifier: ICC identifier such as 'sRGB'
+    :param pdfmark: a dictionary containing keys to include the pdfmark
+    :param ascii_docinfo: if True, the docinfo block must be encoded in pure
+        ASCII and may not contain UTF-16BE-BOM-hex encoded strings, as
+        required for Ghostscript 9.24+
+
+    :returns: a string containing the entire pdfmark
+
+    """
+
+    # Ghostscript <= 9.21 has a bug where null entries in DOCINFO might produce
+    # ERROR: VMerror (-25) on closing pdfwrite device.
+    # https://bugs.ghostscript.com/show_bug.cgi?id=697684
+    # Work around this by only adding keys that have a nontrivial value
+    docinfo_keys = ('/Title', '/Author', '/Subject', '/Creator', '/Keywords')
+
+    def docinfo_gen():
+        if not ascii_docinfo:
+            docinfo_line_template = '  {key} <{value}>'
+            encode = encode_text_string
+        else:
+            docinfo_line_template = '  {key} ({value})'
+            encode = _encode_ascii
+        yield from _get_pdfmark_dates(pdfmark)
+        for key in docinfo_keys:
+            if key in pdfmark and pdfmark[key].strip() != '':
+                line = docinfo_line_template.format(
+                    key=key, value=encode(pdfmark[key]))
+                yield line
+    docinfo = '\n'.join(docinfo_gen())
+
+    t = Template(pdfa_def_template)
+    result = t.substitute(icc_profile=icc_profile,
+                          icc_identifier=icc_identifier,
+                          docinfo=docinfo)
+    return result
+
+
+def generate_pdfa_ps(target_filename, pdfmark, icc='sRGB', ascii_docinfo=False):
+    if icc == 'sRGB':
+        icc_profile = SRGB_ICC_PROFILE
+    else:
+        raise NotImplementedError("Only supporting sRGB")
+
+    # pdfmark must contain the full path to the ICC profile, and pdfmark must
+    # also encoded in ASCII. ocrmypdf can be installed anywhere, including to
+    # paths that have a non-ASCII character in the filename. Ghostscript
+    # accepts hex-encoded strings and converts them to byte strings, so
+    # we encode the path with fsencode() and use the hex representation.
+    # UTF-16 not accepted here. (Even though ASCII encodable is the usual case,
+    # do this always to avoid making it a rare conditional.)
+    bytes_icc_profile = os.fsencode(icc_profile)
+    hex_icc_profile = hexlify(bytes_icc_profile)
+    icc_profile = '<' + hex_icc_profile.decode('ascii') + '>'
+
+    ps = _get_pdfa_def(icc_profile, icc, pdfmark, ascii_docinfo=ascii_docinfo)
+
+    # We should have encoded everything to pure ASCII by this point, and
+    # to be safe, only allow ASCII in PostScript
+    Path(target_filename).write_text(ps, encoding='ascii')
+
+
+def file_claims_pdfa(filename):
+    """Determines if the file claims to be PDF/A compliant
+
+    Checking if a file is a truly compliant PDF/A is a massive undertaking
+    that no open source tool does properly.  Some commercial tools are
+    generally reliable (Acrobat).
+
+    This checks if the XMP metadata contains a PDF/A marker.
+    """
+
+    xmp = file_to_dict(filename)
+    if not xmp:
+        return {'pass': False, 'output': 'pdf',
+                'conformance': 'No XMP metadata'}
+
+    if not consts.XMP_NS_PDFA_ID in xmp:
+        return {'pass': False, 'output': 'pdf',
+                'conformance': 'No PDF/A metadata in XMP'}
+
+    pdfa_node = xmp[consts.XMP_NS_PDFA_ID]
+    def read_node(node, key):
+        return next(
+            (v for k, v, meta in node if k == key), ''
+        )
+
+    part = read_node(pdfa_node, 'pdfaid:part')
+    conformance = read_node(pdfa_node, 'pdfaid:conformance')
+
+    part_conformance = part + conformance
+    valid_part_conforms = {'1A', '1B', '2A', '2B', '2U', '3A', '3B', '3U'}
+
+    conformance = 'PDF/A-{}'.format(
+        part_conformance)
+
+    pdfa_dict = {}
+    if part_conformance in valid_part_conforms:
+        pdfa_dict['pass'] = True
+        pdfa_dict['output'] = 'pdfa'
+    pdfa_dict['conformance'] = conformance
+
+    return pdfa_dict

src/ocrmypdf/pdfinfo.py

@@ -0,0 +1,766 @@
+#!/usr/bin/env python3
+# © 2015 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from collections import namedtuple
+from decimal import Decimal
+from enum import Enum
+from math import hypot, isclose
+from pathlib import Path
+from unittest.mock import Mock
+import re
+import xml.etree.ElementTree as ET
+
+from .exec import ghostscript
+from .helpers import fspath
+
+from pikepdf import PdfMatrix
+import pikepdf
+
+Colorspace = Enum('Colorspace',
+                  'gray rgb cmyk lab icc index sep devn pattern jpeg2000')
+
+Encoding = Enum('Encoding',
+                'ccitt jpeg jpeg2000 jbig2 asciihex ascii85 lzw flate ' + \
+                'runlength')
+
+# Forgive me for I have sinned
+# I am using regular expressions to parse XML. However the XML in this case,
+# generated by Ghostscript, is self-consistent enough to be parseable.
+regex_remove_char_tags = re.compile(br"""
+    <char\b
+    (?:   [^>]   # anything single character but >
+        | \">\"  # special case: trap ">"
+    )*
+    />           # terminate with '/>'
+""", re.VERBOSE)
+
+FRIENDLY_COLORSPACE = {
+    '/DeviceGray': Colorspace.gray,
+    '/CalGray': Colorspace.gray,
+    '/DeviceRGB': Colorspace.rgb,
+    '/CalRGB': Colorspace.rgb,
+    '/DeviceCMYK': Colorspace.cmyk,
+    '/Lab': Colorspace.lab,
+    '/ICCBased': Colorspace.icc,
+    '/Indexed': Colorspace.index,
+    '/Separation': Colorspace.sep,
+    '/DeviceN': Colorspace.devn,
+    '/Pattern': Colorspace.pattern,
+    '/G': Colorspace.gray,  # Abbreviations permitted in inline images
+    '/RGB': Colorspace.rgb,
+    '/CMYK': Colorspace.cmyk,
+    '/I': Colorspace.index,
+}
+
+FRIENDLY_ENCODING = {
+    '/CCITTFaxDecode': Encoding.ccitt,
+    '/DCTDecode': Encoding.jpeg,
+    '/JPXDecode': Encoding.jpeg2000,
+    '/JBIG2Decode': Encoding.jbig2,
+    '/CCF': Encoding.ccitt,  # Abbreviations permitted in inline images
+    '/DCT': Encoding.jpeg,
+    '/AHx': Encoding.asciihex,
+    '/A85': Encoding.ascii85,
+    '/LZW': Encoding.lzw,
+    '/Fl': Encoding.flate,
+    '/RL': Encoding.runlength
+}
+
+FRIENDLY_COMP = {
+    Colorspace.gray: 1,
+    Colorspace.rgb: 3,
+    Colorspace.cmyk: 4,
+    Colorspace.lab: 3,
+    Colorspace.index: 1
+}
+
+
+UNIT_SQUARE = (1.0, 0.0, 0.0, 1.0, 0.0, 0.0)
+
+def _is_unit_square(shorthand):
+    values = map(float, shorthand)
+    pairwise = zip(values, UNIT_SQUARE)
+    return all([isclose(a, b, rel_tol=1e-3) for a, b in pairwise])
+
+XobjectSettings = namedtuple('XobjectSettings',
+    ['name', 'shorthand', 'stack_depth'])
+
+InlineSettings = namedtuple('InlineSettings',
+    ['iimage', 'shorthand', 'stack_depth'])
+
+ContentsInfo = namedtuple('ContentsInfo',
+    ['xobject_settings', 'inline_images', 'found_text'])
+
+
+
+def _normalize_stack(operations):
+    """Convert runs of qQ's in the stack into single operations"""
+    for operands, command in operations:
+        command = str(command)
+        if re.match(r'Q*q+$', command):   # Zero or more Q, one or more q
+            for char in command:          # Split into individual
+                yield ([], char)          # Yield individual
+        else:
+            yield (operands, command)
+
+
+def _interpret_contents(contentstream, initial_shorthand=UNIT_SQUARE):
+    """Interpret the PDF content stream
+
+    The stack represents the state of the PDF graphics stack.  We are only
+    interested in the current transformation matrix (CTM) so we only track
+    this object; a full implementation would need to track many other items.
+
+    The CTM is initialized to the mapping from user space to device space.
+    PDF units are 1/72".  In a PDF viewer or printer this matrix is initialized
+    to the transformation to device space.  For example if set to
+    (1/72, 0, 0, 1/72, 0, 0) then all units would be calculated in inches.
+
+    Images are always considered to be (0, 0) -> (1, 1).  Before drawing an
+    image there should be a 'cm' that sets up an image coordinate system
+    where drawing from (0, 0) -> (1, 1) will draw on the desired area of the
+    page.
+
+    PDF units suit our needs so we initialize ctm to the identity matrix.
+
+    """
+
+    stack = []
+    ctm = PdfMatrix(initial_shorthand)
+    xobject_settings = []
+    inline_images = []
+    found_text = False
+    text_operators = set(['Tj', 'TJ', '"', "'"])
+    operator_whitelist = """q Q Do cm TJ Tj " ' BI ID EI"""
+
+    for n, op in enumerate(_normalize_stack(
+            pikepdf.parse_content_stream(contentstream, operator_whitelist))):
+        operands, command = op
+
+        if command == 'q':
+            stack.append(ctm)
+            if len(stack) > 32:
+                raise RuntimeError(
+                    "PDF graphics stack overflow, command %i" % n)
+        elif command == 'Q':
+            try:
+                ctm = stack.pop()
+            except IndexError:
+                raise RuntimeError(
+                    "PDF graphics stack underflow, command %i" % n)
+        elif command == 'cm':
+            ctm = PdfMatrix(operands) @ ctm
+        elif command == 'Do':
+            image_name = operands[0]
+            settings = XobjectSettings(
+                name=image_name, shorthand=ctm.shorthand,
+                stack_depth=len(stack))
+            xobject_settings.append(settings)
+        elif command == 'INLINE IMAGE':
+            iimage = operands[0]
+            inline = InlineSettings(
+                iimage=iimage, shorthand=ctm.shorthand,
+                stack_depth=len(stack))
+            inline_images.append(inline)
+        elif command in text_operators:
+            found_text = True
+
+
+    return ContentsInfo(
+        xobject_settings=xobject_settings,
+        inline_images=inline_images,
+        found_text=found_text)
+
+
+def _get_dpi(ctm_shorthand, image_size):
+    """Given the transformation matrix and image size, find the image DPI.
+
+    PDFs do not include image resolution information within image data.
+    Instead, the PDF page content stream describes the location where the
+    image will be rasterized, and the effective resolution is the ratio of the
+    pixel size to raster target size.
+
+    Normally a scanned PDF has the paper size set appropriately but this is
+    not guaranteed. The most common case is a cropped image will change the
+    page size (/CropBox) without altering the page content stream. That means
+    it is not sufficient to assume that the image fills the page, even though
+    that is the most common case.
+
+    A PDF image may be scaled (always), cropped, translated, rotated in place
+    to an arbitrary angle (rarely) and skewed. Only equal area mappings can
+    be expressed, that is, it is not necessary to consider distortions where
+    the effective DPI varies with position.
+
+    To determine the image scale, transform an offset axis vector v0 (0, 0),
+    width-axis vector v0 (1, 0), height-axis vector vh (0, 1) with the matrix,
+    which gives the dimensions of the image in PDF units. From there we can
+    compare to actual image dimensions. PDF uses
+    row vector * matrix_tranposed unlike the traditional
+    matrix * column vector.
+
+    The offset, width and height vectors can be combined in a matrix and
+    multiplied by the transform matrix. Then we want to calculated
+        magnitude(width_vector - offset_vector)
+    and
+        magnitude(height_vector - offset_vector)
+
+    When the above is worked out algebraically, the effect of translation
+    cancels out, and the vector magnitudes become functions of the nonzero
+    transformation matrix indices. The results of the derivation are used
+    in this code.
+
+    pdfimages -list does calculate the DPI in some way that is not completely
+    naive, but it does not get the DPI of rotated images right, so cannot be
+    used anymore to validate this. Photoshop works, or using Acrobat to
+    rotate the image back to normal.
+
+    It does not matter if the image is partially cropped, or even out of the
+    /MediaBox.
+
+    """
+
+    a, b, c, d, _, _ = ctm_shorthand
+
+    # Calculate the width and height of the image in PDF units
+    image_drawn_width = hypot(a, b)
+    image_drawn_height = hypot(c, d)
+
+    # The scale of the image is pixels per unit of default user space (1/72")
+    scale_w = image_size[0] / image_drawn_width
+    scale_h = image_size[1] / image_drawn_height
+
+    # DPI = scale * 72
+    dpi_w = scale_w * 72.0
+    dpi_h = scale_h * 72.0
+
+    return dpi_w, dpi_h
+
+
+class ImageInfo:
+    DPI_PREC = Decimal('1.000')
+
+    def __init__(self, *, name='', pdfimage=None, inline=None,
+                 shorthand=None):
+
+        self._name = str(name)
+        self._shorthand = shorthand
+
+        if inline is not None:
+            self._origin = 'inline'
+            pim = inline.iimage
+        elif pdfimage is not None:
+            self._origin = 'xobject'
+            pim = pikepdf.PdfImage(pdfimage)
+        self._width = pim.width
+        self._height = pim.height
+
+        # If /ImageMask is true, then this image is a stencil mask
+        # (Images that draw with this stencil mask will have a reference to
+        # it in their /Mask, but we don't actually need that information)
+        if pim.image_mask:
+            self._type = 'stencil'
+        else:
+            self._type = 'image'
+
+        self._bpc = int(pim.bits_per_component)
+        try:
+            self._enc = FRIENDLY_ENCODING.get(pim.filters[0], 'image')
+        except IndexError:
+            self._enc = '?'
+
+        try:
+            self._color = FRIENDLY_COLORSPACE.get(pim.colorspace, '?')
+        except NotImplementedError:
+            self._color = '?'
+        if self._enc == Encoding.jpeg2000:
+            self._color = Colorspace.jpeg2000
+
+        self._comp = FRIENDLY_COMP.get(self._color, '?')
+
+        # Bit of a hack... infer grayscale if component count is uncertain
+        # but encoding must be monochrome. This happens if a monochrome image
+        # has an ICC profile attached. Better solution would be to examine
+        # the ICC profile.
+        if self._comp == '?' and self._enc in (Encoding.ccitt, 'jbig2'):
+            self._comp = FRIENDLY_COMP[Colorspace.gray]
+
+    @property
+    def name(self):
+        return self._name
+
+    @property
+    def type_(self):
+        return self._type
+
+    @property
+    def width(self):
+        return self._width
+
+    @property
+    def height(self):
+        return self._height
+
+    @property
+    def bpc(self):
+        return self._bpc
+
+    @property
+    def color(self):
+        return self._color
+
+    @property
+    def comp(self):
+        return self._comp
+
+    @property
+    def enc(self):
+        return self._enc
+
+    @property
+    def xres(self):
+        return _get_dpi(self._shorthand, (self._width, self._height))[0]
+
+    @property
+    def yres(self):
+        return _get_dpi(self._shorthand, (self._width, self._height))[1]
+
+    def __repr__(self):
+        class_locals = {attr: getattr(self, attr, None) for attr in dir(self)
+                        if not attr.startswith('_')}
+        return (
+            "<ImageInfo '{name}' {type_} {width}x{height} {color} "
+            "{comp} {bpc} {enc} {xres}x{yres}>").format(**class_locals)
+
+
+def _find_inline_images(contentsinfo):
+    "Find inline images in the contentstream"
+
+    for n, inline in enumerate(contentsinfo.inline_images):
+        yield ImageInfo(name='inline-%02d' % n, shorthand=inline.shorthand,
+                        inline=inline)
+
+
+def _image_xobjects(container):
+    """Search for all XObject-based images in the container
+
+    Usually the container is a page, but it could also be a Form XObject
+    that contains images. Filter out the Form XObjects which are dealt with
+    elsewhere.
+
+    Generate a sequence of tuples (image, xobj container), where container,
+    where xobj is the name of the object and image is the object itself,
+    since the object does not know its own name.
+
+    """
+
+    if '/Resources' not in container:
+        return
+    resources = container['/Resources']
+    if '/XObject' not in resources:
+        return
+    xobjs = resources['/XObject'].as_dict()
+    for xobj in xobjs:
+        candidate = xobjs[xobj]
+        if candidate['/Subtype'] == '/Image':
+            pdfimage = candidate
+            yield (pdfimage, xobj)
+
+
+def _find_regular_images(container, contentsinfo):
+    """Find images stored in the container's /Resources /XObject
+
+    Usually the container is a page, but it could also be a Form XObject
+    that contains images.
+
+    Generates images with their DPI at time of drawing.
+
+    """
+
+    for pdfimage, xobj in _image_xobjects(container):
+
+        # For each image that is drawn on this, check if we drawing the
+        # current image - yes this is O(n^2), but n == 1 almost always
+        for draw in contentsinfo.xobject_settings:
+            if draw.name != xobj:
+                continue
+
+            if draw.stack_depth == 0 and _is_unit_square(draw.shorthand):
+                # At least one PDF in the wild (and test suite) draws an image
+                # when the graphics stack depth is 0, meaning that the image
+                # gets drawn into a square of 1x1 PDF units (or 1/72",
+                # or 0.35 mm).  The equivalent DPI will be >100,000.  Exclude
+                # these from our DPI calculation for the page.
+                continue
+
+            yield ImageInfo(name=draw.name, pdfimage=pdfimage, shorthand=
+                            draw.shorthand)
+
+
+def _find_form_xobject_images(pdf, container, contentsinfo):
+    """Find any images that are in Form XObjects in the container
+
+    The container may be a page, or a parent Form XObject.
+
+    """
+    if '/Resources' not in container:
+        return
+    resources = container['/Resources']
+    if '/XObject' not in resources:
+        return
+    xobjs = resources['/XObject'].as_dict()
+    for xobj in xobjs:
+        candidate = xobjs[xobj]
+        if candidate['/Subtype'] != '/Form':
+            continue
+
+        form_xobject = candidate
+        for settings in contentsinfo.xobject_settings:
+            if settings.name != xobj:
+                continue
+
+            # Find images once for each time this Form XObject is drawn.
+            # This could be optimized to cache the multiple drawing events
+            # but in practice both Form XObjects and multiple drawing of the
+            # same object are both very rare.
+            ctm_shorthand = settings.shorthand
+            yield from _find_images(
+                pdf=pdf, container=form_xobject, shorthand=ctm_shorthand)
+
+
+def _find_images(*, pdf, container, shorthand=None):
+    """Find all individual instances of images drawn in the container
+
+    Usually the container is a page, but it may also be a Form XObject.
+
+    On a typical page images are stored inline or as regular images
+    in an XObject.
+
+    Form XObjects may include inline images, XObject images,
+    and recursively, other Form XObjects; and also vector drawing commands.
+
+    Every instance of an image being drawn somewhere is flattened and
+    treated as a unique image, since if the same image is drawn multiple times
+    on one page it may be drawn at differing resolutions, and our objective
+    is to find the resolution at which the page can be rastered without
+    downsampling.
+
+    """
+
+    if container.get('/Type') == '/Page' and '/Contents' in container:
+        initial_shorthand = shorthand or UNIT_SQUARE
+    elif container.get('/Type') == '/XObject' and \
+            container['/Subtype'] == '/Form':
+        # Set the CTM to the state it was when the "Do" operator was
+        # encountered that is drawing this instance of the Form XObject
+        ctm = PdfMatrix(shorthand) if shorthand else PdfMatrix.identity()
+
+        # A Form XObject may provide its own matrix to map form space into
+        # user space. Get this if one exists
+        form_shorthand = container.get('/Matrix', PdfMatrix.identity())
+        form_matrix = PdfMatrix(form_shorthand)
+
+        # Concatenate form matrix with CTM to ensure CTM is correct for
+        # drawing this instance of the XObject
+        ctm = form_matrix @ ctm
+        initial_shorthand = ctm.shorthand
+    else:
+        return
+
+    contentsinfo = _interpret_contents(container, initial_shorthand)
+
+    yield from _find_inline_images(contentsinfo)
+    yield from _find_regular_images(container, contentsinfo)
+    yield from _find_form_xobject_images(pdf, container, contentsinfo)
+
+
+def _page_get_textblocks(infile, pageno, xmltext):
+    """Smarter text detection"""
+
+    root = xmltext
+    if not hasattr(xmltext, 'findall'):
+        return []
+
+    def blocks():
+        for span in root.findall('.//span'):
+            bbox_str = span.attrib['bbox']
+            font_size = span.attrib['size']
+            pts = [int(pt) for pt in bbox_str.split()]
+            pts[1] = pts[1] - int(float(font_size) + 0.5)
+            bbox = tuple(pts)
+            yield bbox
+
+    def joined_blocks():
+        prev = None
+        for bbox in blocks():
+            if prev is None:
+                prev = bbox
+            if bbox[1] == prev[1] and bbox[3] == prev[3]:
+                gap = prev[2] - bbox[0]
+                height = bbox[3] - bbox[1]
+                if gap < height:
+                    # Join boxes
+                    prev = (prev[0], prev[1], bbox[2], bbox[3])
+                    continue
+            # yield previously joined bboxes and start anew
+            yield prev
+            prev = bbox
+        if prev is not None:
+            yield prev
+
+    return [block for block in joined_blocks()]
+
+
+def _page_has_text(text_blocks, page_width, page_height):
+    """Smarter text detection that ignores text in margins"""
+
+    pw, ph = float(page_width), float(page_height)
+
+    margin_ratio = 0.125
+    interior_bbox = (
+        margin_ratio * pw, margin_ratio * ph,
+        (1 - margin_ratio) * pw, (1 - margin_ratio) * ph
+    )
+
+    def rects_intersect(a, b):
+        """
+        Where (a,b) are 4-tuple rects (left-0, top-1, right-2, bottom-3)
+        https://stackoverflow.com/questions/306316/determine-if-two-rectangles-overlap-each-other
+        Negative signs to account for our coordinates being in the fourth quadrant
+        and the formula assuming the first
+        """
+        return a[0] < b[2] and a[2] > b[0] and -a[1] > -b[3] and -a[3] < -b[1]
+
+    has_text = False
+    for bbox in text_blocks:
+        if rects_intersect(bbox, interior_bbox):
+            has_text = True
+            break
+    return has_text
+
+
+def _pdf_get_pageinfo(pdf, pageno: int, infile, xmltext):
+    pageinfo = {}
+    pageinfo['pageno'] = pageno
+    pageinfo['images'] = []
+
+    page = pdf.pages[pageno]
+
+    pageinfo['textinfo'] = _page_get_textblocks(
+        fspath(infile), pageno, xmltext=xmltext)
+
+    mediabox = [Decimal(d) for d in page.MediaBox.as_list()]
+    width_pt = mediabox[2] - mediabox[0]
+    height_pt = mediabox[3] - mediabox[1]
+
+    pageinfo['has_text'] = _page_has_text(
+        pageinfo['textinfo'], width_pt, height_pt)
+
+    userunit = page.get('/UserUnit', Decimal(1.0))
+    if not isinstance(userunit, Decimal):
+        userunit = Decimal(userunit)
+    pageinfo['userunit'] = userunit
+    pageinfo['width_inches'] = width_pt * userunit / Decimal(72.0)
+    pageinfo['height_inches'] = height_pt * userunit / Decimal(72.0)
+
+    try:
+        pageinfo['rotate'] = int(page['/Rotate'])
+    except KeyError:
+        pageinfo['rotate'] = 0
+
+    userunit_shorthand = (userunit, 0, 0, userunit, 0, 0)
+    pageinfo['images'] = [im for im in
+                          _find_images(pdf=pdf, container=page,
+                                       shorthand=userunit_shorthand)]
+    if pageinfo['images']:
+        xres = Decimal(max(image.xres for image in pageinfo['images']))
+        yres = Decimal(max(image.yres for image in pageinfo['images']))
+        pageinfo['xres'], pageinfo['yres'] = xres, yres
+        pageinfo['width_pixels'] = \
+            int(round(xres * pageinfo['width_inches']))
+        pageinfo['height_pixels'] = \
+            int(round(yres * pageinfo['height_inches']))
+
+    return pageinfo
+
+
+def _pdf_get_all_pageinfo(infile, log=None):
+    if not log:
+        log = Mock()
+
+    pdf = pikepdf.open(infile)
+
+    existing_text = ghostscript.extract_text(infile, pageno=None)
+    existing_text = regex_remove_char_tags.sub(b' ', existing_text)
+
+    try:
+        root = ET.fromstringlist([
+            b'<document>\n', existing_text, b'</document>\n'
+        ])
+        page_xml = root.findall('page')
+    except ET.ParseError as e:
+        log.error(
+            "An error occurred while attempting to retrieve existing text in "
+            "the input file. Will attempt to continue assuming that there is "
+            "no existing text in the file. The error was:")
+        log.error(e)
+        page_xml = [None] * len(pdf.pages)
+
+    page_count_difference = len(pdf.pages) - len(page_xml)
+    if page_count_difference != 0:
+        log.error("The number of pages in the input file is inconsistent.")
+        if page_count_difference > 0:
+            page_xml.extend([None] * page_count_difference)
+
+    pages = []
+    for n in range(len(pdf.pages)):
+        page = PageInfo(pdf, n, infile, page_xml[n])
+        pages.append(page)
+
+    return pages, pdf
+
+
+class PageInfo:
+    def __init__(self, pdf, pageno, infile, xmltext):
+        self._pageno = pageno
+        self._infile = infile
+        self._pageinfo = _pdf_get_pageinfo(pdf, pageno, infile, xmltext)
+
+    @property
+    def pageno(self):
+        return self._pageno
+
+    @property
+    def has_text(self):
+        return self._pageinfo['has_text']
+
+    @property
+    def width_inches(self):
+        return self._pageinfo['width_inches']
+
+    @property
+    def height_inches(self):
+        return self._pageinfo['height_inches']
+
+    @property
+    def width_pixels(self):
+        return int(round(self.width_inches * self.xres))
+
+    @property
+    def height_pixels(self):
+        return int(round(self.height_inches * self.yres))
+
+    @property
+    def rotation(self):
+        return self._pageinfo.get('rotate', None)
+
+    @rotation.setter
+    def rotation(self, value):
+        if value in (0, 90, 180, 270, 360, -90, -180, -270):
+            self._pageinfo['rotate'] = value
+        else:
+            raise ValueError("rotation must be a cardinal angle")
+
+    @property
+    def images(self):
+        return self._pageinfo['images']
+
+    def get_textareas(self):
+        yield from self._pageinfo['textinfo']
+
+    @property
+    def xres(self):
+        return self._pageinfo.get('xres', None)
+
+    @property
+    def yres(self):
+        return self._pageinfo.get('yres', None)
+
+    @property
+    def userunit(self):
+        return self._pageinfo.get('userunit', None)
+
+    @property
+    def min_version(self):
+        if self.userunit is not None:
+            return '1.6'
+        else:
+            return '1.5'
+
+    def __repr__(self):
+        return (
+            '<PageInfo '
+            'pageno={} {}"x{}" rotation={} res={}x{} has_text={}>').format(
+            self.pageno, self.width_inches, self.height_inches,
+            self.rotation,
+            self.xres, self.yres, self.has_text
+        )
+
+
+class PdfInfo:
+    """Get summary information about a PDF
+
+    """
+    def __init__(self, infile, log=None):
+        self._infile = infile
+        self._pages, pdf = _pdf_get_all_pageinfo(infile, log=log)
+        self._needs_rendering = pdf.root.get('/NeedsRendering', False)
+
+    @property
+    def pages(self):
+        return self._pages
+
+    @property
+    def min_version(self):
+        # The minimum PDF is the maximum version that any particular page needs
+        return max(page.min_version for page in self.pages)
+
+    @property
+    def has_userunit(self):
+        return any(page.userunit != 1.0 for page in self.pages)
+
+    @property
+    def filename(self):
+        if not isinstance(self._infile, (str, Path)):
+            raise NotImplementedError("can't get filename from stream")
+        return self._infile
+
+    @property
+    def needs_rendering(self):
+        return self._needs_rendering
+
+    def __getitem__(self, item):
+        return self._pages[item]
+
+    def __len__(self):
+        return len(self._pages)
+
+    def __repr__(self):
+        return "<PdfInfo('...'), page count={}>".format(len(self))
+
+def main():
+    import argparse
+    parser = argparse.ArgumentParser()
+    parser.add_argument('infile')
+    args = parser.parse_args()
+    info = _pdf_get_all_pageinfo(args.infile)
+    from pprint import pprint
+    pprint(info)
+
+
+if __name__ == '__main__':
+    main()

test_requirements.txt

@@ -1,2 +0,0 @@
-img2pdf>=0.1.5
-pytest>=2.7.2

tests/cache/2400dpi/__-l__eng__000001.ocr.png__000001.text__pdf__txt/stderr.bin

@@ -0,0 +1 @@
+Tesseract Open Source OCR Engine v3.05.01 with Leptonica

tests/cache/2400dpi/__-l__eng__000001.ocr.png__000001.text__pdf__txt/txt.bin

@@ -0,0 +1,25 @@
+é la Waterman
+
+h ens linzen
+
+3 liter water
+
+3 mien
+
+bloem} hater
+
+2 kopjes melk
+
+laurier, kruidnagel, kerrie, gout
+
+Be linzen wassen en in¢l liter kokend wa-
+ter 1 dag laten weken. 2 liter water bi'
+de linzen voegen, gender hat water wagrin
+ze geweekt zijn af te gieten. De helft Van
+de mien bakken met laurier en kruiénagal.
+Alla mien, kerrie en zout bij de linzen
+voegen. A1135 aan de Rook brengem. Van de
+bloem mat boter-en melk een papje maken en
+verder afmaken met de soap. A13 de linzen
+gaar zijn is de seep klaar.
+

tests/cache/aspect/__-l__eng__000001.ocr.png__000001.text__pdf__txt/stderr.bin

@@ -0,0 +1,3 @@
+Tesseract Open Source OCR Engine v3.05.01 with Leptonica
+Too few characters. Skipping this page
+OSD: Weak margin (0.00) for 24 blob text block, but using orientation anyway: 0

tests/cache/aspect/__-l__eng__000001.ocr.png__000001.text__pdf__txt/txt.bin

@@ -0,0 +1,4 @@
+ 
+
+This shnuld be a perfect circle-
+

tests/cache/aspect/__-l__eng__000001.ocr.png__000001__hocr__txt/hocr.bin

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+ <head>
+  <title></title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+  <meta name='ocr-system' content='tesseract 3.05.01' />
+  <meta name='ocr-capabilities' content='ocr_page ocr_carea ocr_par ocr_line ocrx_word'/>
+</head>
+<body>
+  <div class='ocr_page' id='page_1' title='image "/var/folders/37/78_114p552q16vv6vmgm5kr00000gn/T/com.github.ocrmypdf.7vjmeixk/000001.ocr.png"; bbox 0 0 1000 800; ppageno 0'>
+   <div class='ocr_carea' id='block_1_1' title="bbox 296 96 704 504">
+    <p class='ocr_par' id='par_1_1' lang='eng' title="bbox 296 96 704 504">
+     <span class='ocr_line' id='line_1_1' title="bbox 296 96 704 504; baseline 0 296; x_size 169.33333; x_descenders 42.333332; x_ascenders 42.333336"><span class='ocrx_word' id='word_1_1' title='bbox 296 96 704 504; x_wconf 95'><strong> </strong></span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_2' title="bbox 150 592 841 622">
+    <p class='ocr_par' id='par_1_2' lang='eng' title="bbox 150 592 841 622">
+     <span class='ocr_line' id='line_1_2' title="bbox 150 592 841 622; baseline 0 -6; x_size 30; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_2' title='bbox 150 592 230 616; x_wconf 85'><strong>This</strong></span> <span class='ocrx_word' id='word_1_3' title='bbox 260 592 384 616; x_wconf 81'>shnuld</span> <span class='ocrx_word' id='word_1_4' title='bbox 413 592 449 616; x_wconf 81'><strong>be</strong></span> <span class='ocrx_word' id='word_1_5' title='bbox 479 600 493 616; x_wconf 85'><em>a</em></span> <span class='ocrx_word' id='word_1_6' title='bbox 523 592 668 622; x_wconf 76'>perfect</span> <span class='ocrx_word' id='word_1_7' title='bbox 698 592 841 616; x_wconf 76'><strong>circle-</strong></span> 
+     </span>
+    </p>
+   </div>
+  </div>
+ </body>
+</html>

tests/cache/aspect/__-l__eng__000001.ocr.png__000001__hocr__txt/stderr.bin

@@ -0,0 +1,3 @@
+Tesseract Open Source OCR Engine v3.05.01 with Leptonica
+Too few characters. Skipping this page
+OSD: Weak margin (0.00) for 24 blob text block, but using orientation anyway: 0

tests/cache/aspect/__-l__eng__000001.ocr.png__000001__hocr__txt/txt.bin

@@ -0,0 +1,4 @@
+ 
+
+This shnuld be a perfect circle-
+

tests/cache/cardinal/__-l__eng__000001.ocr.png__000001.text__pdf__txt/stderr.bin

@@ -0,0 +1 @@
+Tesseract Open Source OCR Engine v3.05.01 with Leptonica

tests/cache/cardinal/__-l__eng__000001.ocr.png__000001.text__pdf__txt/txt.bin

@@ -0,0 +1,123 @@
+The LinnSequencer
+32 Track MIDI Sequence Recorder
+
+The LinnSequencer is a state—of—the-art composition and performance tool for the professional musician. It is
+
+extremely powerful, yet amazingly simple to learn and use. It’s many remarkable features include:
+
+0 Operation is similar to multi—track tape recorder with PLAY, STOP, RECORD, FAST
+FORWARD, REWIND, and LOCATE controls.
+
+0 Each of the 100 sequences contains 32 simultaneous, polyphonic tracks. Each track may
+be assigned to one of 16 MIDI channels. Simultaneously plays up to 16 polyphonic
+
+synthesizers !
+
+0 Ultra—fast 3 1/2 ” disk drive stores complex songs in seconds and holds over 110,000 notes
+
+per disk!
+
+0 One or all tracks may be TRANSPOSED at the touch of a key.
+0 Exclusive real—time ERASE function makes editing FAST.
+0 Exclusive REPEAT function automatically repeats any held notes at a pre-selected
+
+rhythmic value.
+
+0 TIMING CORRECTION works during playback and operates without ‘chopping’ notes.
+
+0 Optional SMPTE time code synchronization.
+
+0 Optional remote control.
+
+Recording 3 Sequence
+
+To record a sequence, simply press RECORD and PLAY,
+then play your MIDI keyboard in time to the Sequencer’s
+click track. When the sequence loops back around to bar 1,
+you’ll hear what you played—only all timing errors will be
+
+corrected! (Timing correction may be adjusted or defeated).
+
+Any additional notes played will be added into the track
+—existing notes are not erased while recording!
+
+FAST FORWARD, REWIND, and LOCATE controls
+may be used at any time to quickly access any location in
+your sequence for spot—recording. To overdub a new part,
+select a different track and start recording~while you
+record, the first‘track will play in perfect sync (unless you
+MUTE it, or SOLO another track). In this way, up to 32
+tracks may be overdubbed! All MIDI effects are recorded
+including pitch bend, modulation, velocity, aftertouch,
+sustain pedal, and program changes!
+
+Editing
+
+To erase a wrong note, simply hold ERASE and press
+the note to be erased just before it plays in the sequence—
+when played back, it will be gone. Notes may also be
+
+added, erased, or changed using the SINGLE STEP func-
+tion. To overdub notes at specific points within a sequence,
+
+Additional Features
+
+simply use LOCATE, FAST FORWARD, or REWIND to
+find the desired bar number, then start recording.
+
+The INSERT/COPY function allows you to move bars
+from one location to another—in the same sequence or a
+different one. For example, you might insert a copy of the
+first verse between the second chorus and the bridge.
+DELETE BARS operates the same way to remove
+unwanted sections.
+
+Creating a Song
+
+One way to create a song is to record each track all the
+way through (up to 999 bars). Another way is to record
+each basic section (verse, chorus, etc.) in individual
+sequences, then use the CREATE SONG function to “chain”
+them together. CREATE SONG will then automatically
+copy all the parts into a new sequence. If desired, you can
+even set the last few bars to repeat infinitely, for a fadeout.
+
+Composition Without Compromise
+
+The technology you use should never be so complex that
+it interferes with the creative process. That’s precisely why
+the LinnSequencer is designed to let you compose, record
+and edit while devoting your undivided attention to your
+music. See your Linn dealer today for a demonstration!
+
+0 Simple, easy to learn operation—the 32 character LCD display clearly guides you through all operations. If needed, the
+
+HELP button displays additional explanations.
+
+0 Non-destructive recording—existing notes are not erased while recording.
+0 Two FOOTSWITCH INPUTS may be assigned to remotely control many of the commonly used functions, including
+
+ERASE, REPEAT, PLAY/STOP, or LOCATE.
+
+0 Two TRIGGER OUTPUTS may be programmed to output pulses at any selected note value.
+
+0 Will sync to standard LinnDrum or Linn 9000 sync tone.
+
+' Utilizes ultra high—speed, 8 MHz 80186 16 bit computer internally for FAST operation.
+0 TEMPO may be specified in BEATS-PER—MINUTE or FRAMES-PER—BEAT at 24, 25, or 30 frames per second,
+
+(even drop frame!)
+
+0 TEMPO may be entered numerically, adjustable in tenths of a Beat-Per-Minute increments, or by tapping quarter notes
+
+on the TAP TEMPO button.
+
+0 TEMPO CHANGES may be programmed into a sequence, with smooth transitions if desired.
+° Any TIME SIGNATURE may be used, and may be changed within a song.
+
+E1111
+Linn Electronics, Inc.
+
+18720 Oxnard Street, Tarzana, CA 91356
+(818) 7088131 T ELEX #298949 LINN UR
+

tests/cache/cardinal/__-l__eng__000001.ocr.png__000001__hocr__txt/hocr.bin

@@ -0,0 +1,335 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+ <head>
+  <title></title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+  <meta name='ocr-system' content='tesseract 3.05.01' />
+  <meta name='ocr-capabilities' content='ocr_page ocr_carea ocr_par ocr_line ocrx_word'/>
+</head>
+<body>
+  <div class='ocr_page' id='page_1' title='image "/var/folders/37/78_114p552q16vv6vmgm5kr00000gn/T/com.github.ocrmypdf.wahjk6fa/000001.ocr.png"; bbox 0 0 2550 3300; ppageno 0'>
+   <div class='ocr_carea' id='block_1_1' title="bbox 582 131 1968 303">
+    <p class='ocr_par' id='par_1_1' lang='eng' title="bbox 582 131 1968 303">
+     <span class='ocr_line' id='line_1_1' title="bbox 882 131 1657 217; baseline 0.001 -17; x_size 85; x_descenders 16; x_ascenders 19"><span class='ocrx_word' id='word_1_1' title='bbox 882 132 1036 202; x_wconf 86'>The</span> <span class='ocrx_word' id='word_1_2' title='bbox 1061 131 1657 217; x_wconf 84'>LinnSequencer</span> 
+     </span>
+     <span class='ocr_line' id='line_1_2' title="bbox 582 215 1968 303; baseline 0 -17; x_size 87; x_descenders 16; x_ascenders 21"><span class='ocrx_word' id='word_1_3' title='bbox 582 215 674 286; x_wconf 90'>32</span> <span class='ocrx_word' id='word_1_4' title='bbox 697 218 923 288; x_wconf 84'>Track</span> <span class='ocrx_word' id='word_1_5' title='bbox 948 218 1181 287; x_wconf 94'><strong>MIDI</strong></span> <span class='ocrx_word' id='word_1_6' title='bbox 1208 217 1575 303; x_wconf 89'>Sequence</span> <span class='ocrx_word' id='word_1_7' title='bbox 1600 218 1968 288; x_wconf 83'>Recorder</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_2' title="bbox 347 380 2188 574">
+    <p class='ocr_par' id='par_1_2' lang='eng' title="bbox 347 380 2188 423">
+     <span class='ocr_line' id='line_1_3' title="bbox 347 380 2188 423; baseline -0.001 -12; x_size 38; x_descenders 8; x_ascenders 10"><span class='ocrx_word' id='word_1_8' title='bbox 347 380 412 410; x_wconf 86'>The</span> <span class='ocrx_word' id='word_1_9' title='bbox 424 380 676 417; x_wconf 85'>LinnSequencer</span> <span class='ocrx_word' id='word_1_10' title='bbox 688 380 712 411; x_wconf 87'>is</span> <span class='ocrx_word' id='word_1_11' title='bbox 724 390 743 411; x_wconf 90'>a</span> <span class='ocrx_word' id='word_1_12' title='bbox 754 381 1005 423; x_wconf 79'>state—of—the-art</span> <span class='ocrx_word' id='word_1_13' title='bbox 1017 380 1226 418; x_wconf 86'>composition</span> <span class='ocrx_word' id='word_1_14' title='bbox 1238 381 1299 411; x_wconf 88'>and</span> <span class='ocrx_word' id='word_1_15' title='bbox 1311 380 1525 418; x_wconf 85'>performance</span> <span class='ocrx_word' id='word_1_16' title='bbox 1536 380 1602 411; x_wconf 85'>tool</span> <span class='ocrx_word' id='word_1_17' title='bbox 1615 380 1663 411; x_wconf 82'>for</span> <span class='ocrx_word' id='word_1_18' title='bbox 1674 381 1725 410; x_wconf 94'>the</span> <span class='ocrx_word' id='word_1_19' title='bbox 1737 380 1940 417; x_wconf 85'>professional</span> <span class='ocrx_word' id='word_1_20' title='bbox 1952 380 2112 411; x_wconf 87'>musician.</span> <span class='ocrx_word' id='word_1_21' title='bbox 2127 381 2152 410; x_wconf 90'>It</span> <span class='ocrx_word' id='word_1_22' title='bbox 2164 380 2188 410; x_wconf 90'>is</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_3' lang='eng' title="bbox 347 430 1988 468">
+     <span class='ocr_line' id='line_1_4' title="bbox 347 430 1988 468; baseline 0 -8; x_size 37; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_23' title='bbox 347 430 507 467; x_wconf 86'>extremely</span> <span class='ocrx_word' id='word_1_24' title='bbox 518 430 677 467; x_wconf 84'>powerful,</span> <span class='ocrx_word' id='word_1_25' title='bbox 691 435 739 467; x_wconf 91'>yet</span> <span class='ocrx_word' id='word_1_26' title='bbox 752 430 924 468; x_wconf 87'>amazingly</span> <span class='ocrx_word' id='word_1_27' title='bbox 936 430 1044 468; x_wconf 85'>simple</span> <span class='ocrx_word' id='word_1_28' title='bbox 1055 435 1087 461; x_wconf 87'>to</span> <span class='ocrx_word' id='word_1_29' title='bbox 1099 431 1183 461; x_wconf 88'>learn</span> <span class='ocrx_word' id='word_1_30' title='bbox 1195 431 1257 461; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_31' title='bbox 1269 440 1329 461; x_wconf 89'>use.</span> <span class='ocrx_word' id='word_1_32' title='bbox 1344 431 1393 461; x_wconf 87'>It’s</span> <span class='ocrx_word' id='word_1_33' title='bbox 1406 440 1499 467; x_wconf 91'>many</span> <span class='ocrx_word' id='word_1_34' title='bbox 1510 430 1701 461; x_wconf 88'>remarkable</span> <span class='ocrx_word' id='word_1_35' title='bbox 1714 430 1843 460; x_wconf 85'>features</span> <span class='ocrx_word' id='word_1_36' title='bbox 1856 430 1988 461; x_wconf 87'>include:</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_4' lang='eng' title="bbox 350 482 2093 574">
+     <span class='ocr_line' id='line_1_5' title="bbox 350 482 2093 527; baseline 0 -9; x_size 43; x_descenders 7; x_ascenders 11"><span class='ocrx_word' id='word_1_37' title='bbox 350 490 368 508; x_wconf 68'><strong>0</strong></span> <span class='ocrx_word' id='word_1_38' title='bbox 383 482 585 526; x_wconf 88'>Operation</span> <span class='ocrx_word' id='word_1_39' title='bbox 598 482 627 518; x_wconf 89'>is</span> <span class='ocrx_word' id='word_1_40' title='bbox 641 482 776 518; x_wconf 88'>similar</span> <span class='ocrx_word' id='word_1_41' title='bbox 789 488 829 518; x_wconf 88'>to</span> <span class='ocrx_word' id='word_1_42' title='bbox 843 482 1062 519; x_wconf 86'>multi—track</span> <span class='ocrx_word' id='word_1_43' title='bbox 1076 488 1160 527; x_wconf 92'>tape</span> <span class='ocrx_word' id='word_1_44' title='bbox 1173 483 1336 519; x_wconf 88'>recorder</span> <span class='ocrx_word' id='word_1_45' title='bbox 1350 482 1436 518; x_wconf 87'>with</span> <span class='ocrx_word' id='word_1_46' title='bbox 1451 483 1580 525; x_wconf 90'>PLAY,</span> <span class='ocrx_word' id='word_1_47' title='bbox 1598 483 1724 525; x_wconf 90'>STOP,</span> <span class='ocrx_word' id='word_1_48' title='bbox 1741 483 1957 525; x_wconf 89'>RECORD,</span> <span class='ocrx_word' id='word_1_49' title='bbox 1974 483 2093 518; x_wconf 88'>FAST</span> 
+     </span>
+     <span class='ocr_line' id='line_1_6' title="bbox 383 532 1345 574; baseline 0.001 -7; x_size 43; x_descenders 7; x_ascenders 11"><span class='ocrx_word' id='word_1_50' title='bbox 383 532 635 574; x_wconf 88'>FORWARD,</span> <span class='ocrx_word' id='word_1_51' title='bbox 652 532 865 574; x_wconf 89'>REWIND,</span> <span class='ocrx_word' id='word_1_52' title='bbox 882 532 956 568; x_wconf 91'>and</span> <span class='ocrx_word' id='word_1_53' title='bbox 971 532 1163 568; x_wconf 90'>LOCATE</span> <span class='ocrx_word' id='word_1_54' title='bbox 1177 532 1345 568; x_wconf 87'>controls.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_3' title="bbox 349 589 2136 685">
+    <p class='ocr_par' id='par_1_5' lang='eng' title="bbox 349 589 2136 685">
+     <span class='ocr_line' id='line_1_7' title="bbox 349 589 2136 634; baseline 0.001 -9; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_55' title='bbox 349 597 368 615; x_wconf 67'><strong>0</strong></span> <span class='ocrx_word' id='word_1_56' title='bbox 383 590 482 625; x_wconf 90'>Each</span> <span class='ocrx_word' id='word_1_57' title='bbox 496 589 539 625; x_wconf 87'>of</span> <span class='ocrx_word' id='word_1_58' title='bbox 549 590 611 626; x_wconf 92'>the</span> <span class='ocrx_word' id='word_1_59' title='bbox 625 590 686 625; x_wconf 91'>100</span> <span class='ocrx_word' id='word_1_60' title='bbox 700 601 895 634; x_wconf 89'>sequences</span> <span class='ocrx_word' id='word_1_61' title='bbox 909 590 1075 626; x_wconf 88'>contains</span> <span class='ocrx_word' id='word_1_62' title='bbox 1090 591 1135 626; x_wconf 89'>32</span> <span class='ocrx_word' id='word_1_63' title='bbox 1149 590 1418 633; x_wconf 87'>simultaneous,</span> <span class='ocrx_word' id='word_1_64' title='bbox 1435 590 1661 634; x_wconf 89'>polyphonic</span> <span class='ocrx_word' id='word_1_65' title='bbox 1674 590 1802 626; x_wconf 85'>tracks.</span> <span class='ocrx_word' id='word_1_66' title='bbox 1819 590 1921 626; x_wconf 89'>Each</span> <span class='ocrx_word' id='word_1_67' title='bbox 1934 590 2035 626; x_wconf 88'>track</span> <span class='ocrx_word' id='word_1_68' title='bbox 2050 600 2136 634; x_wconf 89'>may</span> 
+     </span>
+     <span class='ocr_line' id='line_1_8' title="bbox 383 639 2022 685; baseline 0.001 -10; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_69' title='bbox 383 639 428 675; x_wconf 95'>be</span> <span class='ocrx_word' id='word_1_70' title='bbox 442 639 607 684; x_wconf 88'>assigned</span> <span class='ocrx_word' id='word_1_71' title='bbox 621 645 659 676; x_wconf 92'>to</span> <span class='ocrx_word' id='word_1_72' title='bbox 674 650 745 676; x_wconf 91'>one</span> <span class='ocrx_word' id='word_1_73' title='bbox 759 640 801 676; x_wconf 84'>of</span> <span class='ocrx_word' id='word_1_74' title='bbox 813 641 851 676; x_wconf 92'>16</span> <span class='ocrx_word' id='word_1_75' title='bbox 864 641 980 675; x_wconf 90'>MIDI</span> <span class='ocrx_word' id='word_1_76' title='bbox 996 640 1176 676; x_wconf 88'>channels.</span> <span class='ocrx_word' id='word_1_77' title='bbox 1194 640 1498 684; x_wconf 90'>Simultaneously</span> <span class='ocrx_word' id='word_1_78' title='bbox 1510 640 1609 685; x_wconf 90'>plays</span> <span class='ocrx_word' id='word_1_79' title='bbox 1624 651 1674 684; x_wconf 91'>up</span> <span class='ocrx_word' id='word_1_80' title='bbox 1688 645 1727 676; x_wconf 90'>to</span> <span class='ocrx_word' id='word_1_81' title='bbox 1742 641 1780 676; x_wconf 94'>16</span> <span class='ocrx_word' id='word_1_82' title='bbox 1794 640 2022 684; x_wconf 87'>polyphonic</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_4' title="bbox 384 689 632 734">
+    <p class='ocr_par' id='par_1_6' lang='eng' title="bbox 384 689 632 734">
+     <span class='ocr_line' id='line_1_9' title="bbox 384 689 632 734; baseline 0.004 -9; x_size 46; x_descenders 9; x_ascenders 12"><span class='ocrx_word' id='word_1_83' title='bbox 384 689 618 734; x_wconf 84'>synthesizers</span> <span class='ocrx_word' id='word_1_84' title='bbox 625 690 632 726; x_wconf 85'><strong>!</strong></span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_5' title="bbox 349 748 2117 793">
+    <p class='ocr_par' id='par_1_7' lang='eng' title="bbox 349 748 2117 793">
+     <span class='ocr_line' id='line_1_10' title="bbox 349 748 2117 793; baseline 0 -9; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_85' title='bbox 349 755 367 774; x_wconf 66'><strong>0</strong></span> <span class='ocrx_word' id='word_1_86' title='bbox 383 748 573 784; x_wconf 87'>Ultra—fast</span> <span class='ocrx_word' id='word_1_87' title='bbox 588 749 606 784; x_wconf 90'>3</span> <span class='ocrx_word' id='word_1_88' title='bbox 616 749 652 784; x_wconf 86'>1/2</span> <span class='ocrx_word' id='word_1_89' title='bbox 663 749 677 764; x_wconf 87'><em>”</em></span> <span class='ocrx_word' id='word_1_90' title='bbox 694 748 775 784; x_wconf 91'>disk</span> <span class='ocrx_word' id='word_1_91' title='bbox 790 748 887 784; x_wconf 89'>drive</span> <span class='ocrx_word' id='word_1_92' title='bbox 901 754 1012 785; x_wconf 85'>stores</span> <span class='ocrx_word' id='word_1_93' title='bbox 1027 748 1194 793; x_wconf 87'>complex</span> <span class='ocrx_word' id='word_1_94' title='bbox 1208 760 1316 793; x_wconf 87'>songs</span> <span class='ocrx_word' id='word_1_95' title='bbox 1330 748 1368 784; x_wconf 87'>in</span> <span class='ocrx_word' id='word_1_96' title='bbox 1382 748 1535 785; x_wconf 87'>seconds</span> <span class='ocrx_word' id='word_1_97' title='bbox 1550 748 1624 784; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_98' title='bbox 1638 748 1746 784; x_wconf 87'>holds</span> <span class='ocrx_word' id='word_1_99' title='bbox 1761 759 1844 784; x_wconf 85'>over</span> <span class='ocrx_word' id='word_1_100' title='bbox 1859 749 2000 791; x_wconf 88'>110,000</span> <span class='ocrx_word' id='word_1_101' title='bbox 2013 753 2117 784; x_wconf 89'>notes</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_6' title="bbox 383 797 554 842">
+    <p class='ocr_par' id='par_1_8' lang='eng' title="bbox 383 797 554 842">
+     <span class='ocr_line' id='line_1_11' title="bbox 383 797 554 842; baseline 0 -8; x_size 45; x_descenders 8; x_ascenders 12"><span class='ocrx_word' id='word_1_102' title='bbox 383 808 446 842; x_wconf 82'>per</span> <span class='ocrx_word' id='word_1_103' title='bbox 459 797 554 834; x_wconf 86'>disk!</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_7' title="bbox 349 855 2030 1016">
+    <p class='ocr_par' id='par_1_9' lang='eng' title="bbox 349 855 2030 1016">
+     <span class='ocr_line' id='line_1_12' title="bbox 350 855 1638 900; baseline 0.001 -9; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_104' title='bbox 350 863 367 881; x_wconf 71'><strong>0</strong></span> <span class='ocrx_word' id='word_1_105' title='bbox 383 856 464 891; x_wconf 90'>One</span> <span class='ocrx_word' id='word_1_106' title='bbox 478 866 520 891; x_wconf 87'>or</span> <span class='ocrx_word' id='word_1_107' title='bbox 534 855 580 891; x_wconf 88'>all</span> <span class='ocrx_word' id='word_1_108' title='bbox 594 856 712 892; x_wconf 89'>tracks</span> <span class='ocrx_word' id='word_1_109' title='bbox 726 867 811 900; x_wconf 90'>may</span> <span class='ocrx_word' id='word_1_110' title='bbox 823 856 869 892; x_wconf 88'>be</span> <span class='ocrx_word' id='word_1_111' title='bbox 882 856 1212 892; x_wconf 90'>TRANSPOSED</span> <span class='ocrx_word' id='word_1_112' title='bbox 1227 861 1264 892; x_wconf 90'>at</span> <span class='ocrx_word' id='word_1_113' title='bbox 1277 856 1338 892; x_wconf 85'>the</span> <span class='ocrx_word' id='word_1_114' title='bbox 1351 856 1463 892; x_wconf 90'>touch</span> <span class='ocrx_word' id='word_1_115' title='bbox 1477 856 1520 892; x_wconf 89'>of</span> <span class='ocrx_word' id='word_1_116' title='bbox 1531 867 1554 892; x_wconf 90'>a</span> <span class='ocrx_word' id='word_1_117' title='bbox 1568 856 1638 900; x_wconf 89'>key.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_13' title="bbox 350 913 1535 958; baseline 0.001 -9; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_118' title='bbox 350 921 367 939; x_wconf 70'><strong>0</strong></span> <span class='ocrx_word' id='word_1_119' title='bbox 383 913 568 950; x_wconf 84'>Exclusive</span> <span class='ocrx_word' id='word_1_120' title='bbox 581 913 756 950; x_wconf 87'>real—time</span> <span class='ocrx_word' id='word_1_121' title='bbox 769 914 929 950; x_wconf 91'>ERASE</span> <span class='ocrx_word' id='word_1_122' title='bbox 944 914 1114 950; x_wconf 87'>function</span> <span class='ocrx_word' id='word_1_123' title='bbox 1128 914 1251 950; x_wconf 88'>makes</span> <span class='ocrx_word' id='word_1_124' title='bbox 1266 914 1400 958; x_wconf 87'>editing</span> <span class='ocrx_word' id='word_1_125' title='bbox 1414 915 1535 950; x_wconf 91'>FAST.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_14' title="bbox 349 971 2030 1016; baseline 0.001 -10; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_126' title='bbox 349 979 367 997; x_wconf 67'><strong>0</strong></span> <span class='ocrx_word' id='word_1_127' title='bbox 382 971 568 1007; x_wconf 83'>Exclusive</span> <span class='ocrx_word' id='word_1_128' title='bbox 582 972 773 1007; x_wconf 87'>REPEAT</span> <span class='ocrx_word' id='word_1_129' title='bbox 787 972 958 1008; x_wconf 86'>function</span> <span class='ocrx_word' id='word_1_130' title='bbox 971 972 1245 1016; x_wconf 89'>automatically</span> <span class='ocrx_word' id='word_1_131' title='bbox 1258 977 1396 1016; x_wconf 90'>repeats</span> <span class='ocrx_word' id='word_1_132' title='bbox 1410 983 1481 1016; x_wconf 88'>any</span> <span class='ocrx_word' id='word_1_133' title='bbox 1493 972 1578 1008; x_wconf 91'>held</span> <span class='ocrx_word' id='word_1_134' title='bbox 1592 977 1694 1008; x_wconf 91'>notes</span> <span class='ocrx_word' id='word_1_135' title='bbox 1709 977 1746 1008; x_wconf 85'>at</span> <span class='ocrx_word' id='word_1_136' title='bbox 1760 982 1783 1008; x_wconf 89'>a</span> <span class='ocrx_word' id='word_1_137' title='bbox 1796 972 2030 1016; x_wconf 87'>pre-selected</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_8' title="bbox 382 1021 689 1065">
+    <p class='ocr_par' id='par_1_10' lang='eng' title="bbox 382 1021 689 1065">
+     <span class='ocr_line' id='line_1_15' title="bbox 382 1021 689 1065; baseline 0.003 -8; x_size 45; x_descenders 8; x_ascenders 12"><span class='ocrx_word' id='word_1_138' title='bbox 382 1021 564 1065; x_wconf 87'>rhythmic</span> <span class='ocrx_word' id='word_1_139' title='bbox 577 1021 689 1058; x_wconf 86'>value.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_9' title="bbox 349 1080 2174 1125">
+    <p class='ocr_par' id='par_1_11' lang='eng' title="bbox 349 1080 2174 1125">
+     <span class='ocr_line' id='line_1_16' title="bbox 349 1080 2174 1125; baseline 0.001 -11; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_140' title='bbox 349 1087 367 1105; x_wconf 73'><strong>0</strong></span> <span class='ocrx_word' id='word_1_141' title='bbox 382 1080 567 1115; x_wconf 87'>TIMING</span> <span class='ocrx_word' id='word_1_142' title='bbox 582 1080 908 1116; x_wconf 90'>CORRECTION</span> <span class='ocrx_word' id='word_1_143' title='bbox 921 1080 1041 1116; x_wconf 90'>works</span> <span class='ocrx_word' id='word_1_144' title='bbox 1056 1080 1186 1124; x_wconf 86'>during</span> <span class='ocrx_word' id='word_1_145' title='bbox 1199 1080 1378 1124; x_wconf 89'>playback</span> <span class='ocrx_word' id='word_1_146' title='bbox 1392 1080 1466 1116; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_147' title='bbox 1480 1085 1644 1124; x_wconf 87'>operates</span> <span class='ocrx_word' id='word_1_148' title='bbox 1658 1080 1814 1116; x_wconf 91'>without</span> <span class='ocrx_word' id='word_1_149' title='bbox 1831 1080 2044 1125; x_wconf 87'>‘chopping’</span> <span class='ocrx_word' id='word_1_150' title='bbox 2061 1085 2174 1116; x_wconf 88'>notes.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_10' title="bbox 349 1137 1287 1182">
+    <p class='ocr_par' id='par_1_12' lang='eng' title="bbox 349 1137 1287 1182">
+     <span class='ocr_line' id='line_1_17' title="bbox 349 1137 1287 1182; baseline 0.001 -9; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_151' title='bbox 349 1145 367 1163; x_wconf 73'><strong>0</strong></span> <span class='ocrx_word' id='word_1_152' title='bbox 382 1137 560 1182; x_wconf 85'>Optional</span> <span class='ocrx_word' id='word_1_153' title='bbox 575 1138 739 1174; x_wconf 89'>SMPTE</span> <span class='ocrx_word' id='word_1_154' title='bbox 752 1138 839 1174; x_wconf 89'>time</span> <span class='ocrx_word' id='word_1_155' title='bbox 853 1138 945 1174; x_wconf 89'>code</span> <span class='ocrx_word' id='word_1_156' title='bbox 959 1138 1287 1182; x_wconf 88'>synchronization.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_11' title="bbox 349 1195 874 1240">
+    <p class='ocr_par' id='par_1_13' lang='eng' title="bbox 349 1195 874 1240">
+     <span class='ocr_line' id='line_1_18' title="bbox 349 1195 874 1240; baseline 0 -8; x_size 45; x_descenders 8; x_ascenders 12"><span class='ocrx_word' id='word_1_157' title='bbox 349 1203 367 1222; x_wconf 70'><strong>0</strong></span> <span class='ocrx_word' id='word_1_158' title='bbox 382 1195 560 1240; x_wconf 87'>Optional</span> <span class='ocrx_word' id='word_1_159' title='bbox 573 1201 709 1233; x_wconf 86'>remote</span> <span class='ocrx_word' id='word_1_160' title='bbox 723 1196 874 1233; x_wconf 87'>control.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_12' title="bbox 346 1288 1239 1491">
+    <p class='ocr_par' id='par_1_14' lang='eng' title="bbox 346 1288 749 1329">
+     <span class='ocr_line' id='line_1_19' title="bbox 346 1288 749 1329; baseline 0.002 -9; x_size 42; x_descenders 9; x_ascenders 10"><span class='ocrx_word' id='word_1_161' title='bbox 346 1288 535 1329; x_wconf 82'>Recording</span> <span class='ocrx_word' id='word_1_162' title='bbox 547 1298 567 1321; x_wconf 73'>3</span> <span class='ocrx_word' id='word_1_163' title='bbox 579 1288 749 1328; x_wconf 86'>Sequence</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_15' lang='eng' title="bbox 346 1339 1239 1491">
+     <span class='ocr_line' id='line_1_20' title="bbox 383 1339 1239 1373; baseline 0 -7; x_size 33; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_164' title='bbox 383 1340 420 1366; x_wconf 87'>To</span> <span class='ocrx_word' id='word_1_165' title='bbox 430 1339 524 1366; x_wconf 85'>record</span> <span class='ocrx_word' id='word_1_166' title='bbox 535 1347 551 1366; x_wconf 87'>a</span> <span class='ocrx_word' id='word_1_167' title='bbox 562 1347 704 1373; x_wconf 80'>sequence,</span> <span class='ocrx_word' id='word_1_168' title='bbox 716 1340 815 1373; x_wconf 91'>simply</span> <span class='ocrx_word' id='word_1_169' title='bbox 825 1348 898 1373; x_wconf 88'>press</span> <span class='ocrx_word' id='word_1_170' title='bbox 910 1340 1065 1367; x_wconf 90'>RECORD</span> <span class='ocrx_word' id='word_1_171' title='bbox 1075 1340 1131 1367; x_wconf 87'>and</span> <span class='ocrx_word' id='word_1_172' title='bbox 1142 1341 1239 1372; x_wconf 87'>PLAY,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_21' title="bbox 346 1378 1205 1412; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_173' title='bbox 346 1379 411 1406; x_wconf 91'>then</span> <span class='ocrx_word' id='word_1_174' title='bbox 422 1378 483 1412; x_wconf 89'>play</span> <span class='ocrx_word' id='word_1_175' title='bbox 493 1387 562 1412; x_wconf 87'>your</span> <span class='ocrx_word' id='word_1_176' title='bbox 572 1379 659 1405; x_wconf 89'>MIDI</span> <span class='ocrx_word' id='word_1_177' title='bbox 671 1379 810 1412; x_wconf 86'>keyboard</span> <span class='ocrx_word' id='word_1_178' title='bbox 821 1379 848 1406; x_wconf 90'>in</span> <span class='ocrx_word' id='word_1_179' title='bbox 858 1379 923 1406; x_wconf 90'>time</span> <span class='ocrx_word' id='word_1_180' title='bbox 934 1384 963 1406; x_wconf 90'>to</span> <span class='ocrx_word' id='word_1_181' title='bbox 974 1379 1019 1406; x_wconf 92'>the</span> <span class='ocrx_word' id='word_1_182' title='bbox 1030 1379 1205 1412; x_wconf 88'>Sequencer’s</span> 
+     </span>
+     <span class='ocr_line' id='line_1_22' title="bbox 347 1417 1232 1452; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_183' title='bbox 347 1417 414 1445; x_wconf 86'>click</span> <span class='ocrx_word' id='word_1_184' title='bbox 425 1418 506 1445; x_wconf 84'>track.</span> <span class='ocrx_word' id='word_1_185' title='bbox 519 1418 609 1445; x_wconf 85'>When</span> <span class='ocrx_word' id='word_1_186' title='bbox 620 1419 665 1445; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_187' title='bbox 676 1426 810 1452; x_wconf 86'>sequence</span> <span class='ocrx_word' id='word_1_188' title='bbox 821 1419 901 1452; x_wconf 88'>loops</span> <span class='ocrx_word' id='word_1_189' title='bbox 912 1419 983 1446; x_wconf 86'>back</span> <span class='ocrx_word' id='word_1_190' title='bbox 995 1419 1101 1446; x_wconf 90'>around</span> <span class='ocrx_word' id='word_1_191' title='bbox 1112 1423 1141 1446; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_192' title='bbox 1152 1419 1201 1446; x_wconf 87'>bar</span> <span class='ocrx_word' id='word_1_193' title='bbox 1213 1419 1232 1450; x_wconf 88'>1,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_23' title="bbox 346 1457 1223 1491; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_194' title='bbox 346 1457 430 1490; x_wconf 84'>you’ll</span> <span class='ocrx_word' id='word_1_195' title='bbox 441 1457 506 1485; x_wconf 93'>hear</span> <span class='ocrx_word' id='word_1_196' title='bbox 517 1458 590 1485; x_wconf 79'>what</span> <span class='ocrx_word' id='word_1_197' title='bbox 600 1466 654 1491; x_wconf 88'>you</span> <span class='ocrx_word' id='word_1_198' title='bbox 666 1458 865 1491; x_wconf 77'>played—only</span> <span class='ocrx_word' id='word_1_199' title='bbox 876 1458 910 1485; x_wconf 90'>all</span> <span class='ocrx_word' id='word_1_200' title='bbox 921 1458 1018 1491; x_wconf 84'>timing</span> <span class='ocrx_word' id='word_1_201' title='bbox 1029 1466 1115 1485; x_wconf 84'>errors</span> <span class='ocrx_word' id='word_1_202' title='bbox 1126 1458 1179 1485; x_wconf 91'>will</span> <span class='ocrx_word' id='word_1_203' title='bbox 1189 1458 1223 1485; x_wconf 91'>be</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_13' title="bbox 346 1497 1245 1531">
+    <p class='ocr_par' id='par_1_16' lang='eng' title="bbox 346 1497 1245 1531">
+     <span class='ocr_line' id='line_1_24' title="bbox 346 1497 1245 1531; baseline 0.001 -7; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_204' title='bbox 346 1497 494 1524; x_wconf 86'>corrected!</span> <span class='ocrx_word' id='word_1_205' title='bbox 508 1497 628 1530; x_wconf 85'>(Timing</span> <span class='ocrx_word' id='word_1_206' title='bbox 638 1497 791 1525; x_wconf 82'>correction</span> <span class='ocrx_word' id='word_1_207' title='bbox 802 1506 864 1531; x_wconf 88'>may</span> <span class='ocrx_word' id='word_1_208' title='bbox 875 1498 909 1525; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_209' title='bbox 920 1497 1047 1531; x_wconf 81'>adjusted</span> <span class='ocrx_word' id='word_1_210' title='bbox 1058 1505 1089 1525; x_wconf 92'>or</span> <span class='ocrx_word' id='word_1_211' title='bbox 1099 1497 1245 1531; x_wconf 87'>defeated).</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_14' title="bbox 346 1536 1205 1965">
+    <p class='ocr_par' id='par_1_17' lang='eng' title="bbox 346 1536 1186 1610">
+     <span class='ocr_line' id='line_1_25' title="bbox 346 1536 1186 1570; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_212' title='bbox 346 1537 409 1569; x_wconf 90'>Any</span> <span class='ocrx_word' id='word_1_213' title='bbox 419 1536 571 1563; x_wconf 86'>additional</span> <span class='ocrx_word' id='word_1_214' title='bbox 582 1541 659 1564; x_wconf 85'>notes</span> <span class='ocrx_word' id='word_1_215' title='bbox 670 1537 766 1570; x_wconf 87'>played</span> <span class='ocrx_word' id='word_1_216' title='bbox 777 1537 830 1563; x_wconf 88'>will</span> <span class='ocrx_word' id='word_1_217' title='bbox 840 1537 874 1564; x_wconf 92'>be</span> <span class='ocrx_word' id='word_1_218' title='bbox 885 1537 976 1564; x_wconf 88'>added</span> <span class='ocrx_word' id='word_1_219' title='bbox 986 1537 1045 1564; x_wconf 89'>into</span> <span class='ocrx_word' id='word_1_220' title='bbox 1055 1537 1101 1564; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_221' title='bbox 1111 1537 1186 1564; x_wconf 82'>track</span> 
+     </span>
+     <span class='ocr_line' id='line_1_26' title="bbox 347 1575 1052 1610; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_222' title='bbox 347 1575 495 1609; x_wconf 86'>—existing</span> <span class='ocrx_word' id='word_1_223' title='bbox 505 1580 582 1603; x_wconf 89'>notes</span> <span class='ocrx_word' id='word_1_224' title='bbox 593 1584 637 1603; x_wconf 90'>are</span> <span class='ocrx_word' id='word_1_225' title='bbox 648 1580 696 1603; x_wconf 88'>not</span> <span class='ocrx_word' id='word_1_226' title='bbox 707 1576 800 1603; x_wconf 90'>erased</span> <span class='ocrx_word' id='word_1_227' title='bbox 811 1576 890 1603; x_wconf 87'>while</span> <span class='ocrx_word' id='word_1_228' title='bbox 900 1576 1052 1610; x_wconf 87'>recording!</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_18' lang='eng' title="bbox 346 1616 1205 1965">
+     <span class='ocr_line' id='line_1_27' title="bbox 384 1616 1199 1648; baseline 0.001 -6; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_229' title='bbox 384 1616 471 1642; x_wconf 88'>FAST</span> <span class='ocrx_word' id='word_1_230' title='bbox 481 1616 671 1648; x_wconf 88'>FORWARD,</span> <span class='ocrx_word' id='word_1_231' title='bbox 684 1617 844 1648; x_wconf 87'>REWIND,</span> <span class='ocrx_word' id='word_1_232' title='bbox 857 1616 912 1643; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_233' title='bbox 924 1616 1068 1643; x_wconf 78'>LOCATE</span> <span class='ocrx_word' id='word_1_234' title='bbox 1079 1616 1199 1643; x_wconf 87'>controls</span> 
+     </span>
+     <span class='ocr_line' id='line_1_28' title="bbox 346 1655 1202 1689; baseline 0 -7; x_size 34; x_descenders 6; x_ascenders 9"><span class='ocrx_word' id='word_1_235' title='bbox 346 1663 409 1688; x_wconf 89'>may</span> <span class='ocrx_word' id='word_1_236' title='bbox 419 1655 453 1682; x_wconf 94'>be</span> <span class='ocrx_word' id='word_1_237' title='bbox 463 1655 530 1682; x_wconf 90'>used</span> <span class='ocrx_word' id='word_1_238' title='bbox 541 1659 569 1682; x_wconf 90'>at</span> <span class='ocrx_word' id='word_1_239' title='bbox 580 1663 632 1688; x_wconf 86'>any</span> <span class='ocrx_word' id='word_1_240' title='bbox 642 1655 707 1683; x_wconf 88'>time</span> <span class='ocrx_word' id='word_1_241' title='bbox 717 1659 746 1683; x_wconf 88'>to</span> <span class='ocrx_word' id='word_1_242' title='bbox 757 1655 867 1689; x_wconf 88'>quickly</span> <span class='ocrx_word' id='word_1_243' title='bbox 878 1664 968 1683; x_wconf 87'>access</span> <span class='ocrx_word' id='word_1_244' title='bbox 979 1664 1032 1689; x_wconf 87'>any</span> <span class='ocrx_word' id='word_1_245' title='bbox 1042 1655 1164 1683; x_wconf 90'>location</span> <span class='ocrx_word' id='word_1_246' title='bbox 1174 1655 1202 1682; x_wconf 94'>in</span> 
+     </span>
+     <span class='ocr_line' id='line_1_29' title="bbox 346 1694 1204 1728; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_247' title='bbox 346 1702 414 1727; x_wconf 88'>your</span> <span class='ocrx_word' id='word_1_248' title='bbox 424 1702 558 1727; x_wconf 87'>sequence</span> <span class='ocrx_word' id='word_1_249' title='bbox 570 1694 612 1721; x_wconf 84'>for</span> <span class='ocrx_word' id='word_1_250' title='bbox 623 1695 847 1728; x_wconf 84'>spot—recording.</span> <span class='ocrx_word' id='word_1_251' title='bbox 860 1696 897 1722; x_wconf 89'>To</span> <span class='ocrx_word' id='word_1_252' title='bbox 908 1695 1028 1722; x_wconf 82'>overdub</span> <span class='ocrx_word' id='word_1_253' title='bbox 1039 1703 1056 1722; x_wconf 91'>a</span> <span class='ocrx_word' id='word_1_254' title='bbox 1066 1703 1125 1722; x_wconf 89'>new</span> <span class='ocrx_word' id='word_1_255' title='bbox 1135 1699 1204 1728; x_wconf 88'>part,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_30' title="bbox 347 1733 1150 1768; baseline 0.001 -8; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_256' title='bbox 347 1733 426 1761; x_wconf 88'>select</span> <span class='ocrx_word' id='word_1_257' title='bbox 437 1741 453 1761; x_wconf 88'>a</span> <span class='ocrx_word' id='word_1_258' title='bbox 463 1733 589 1761; x_wconf 86'>different</span> <span class='ocrx_word' id='word_1_259' title='bbox 599 1734 674 1761; x_wconf 85'>track</span> <span class='ocrx_word' id='word_1_260' title='bbox 685 1734 741 1761; x_wconf 87'>and</span> <span class='ocrx_word' id='word_1_261' title='bbox 752 1738 818 1761; x_wconf 83'>start</span> <span class='ocrx_word' id='word_1_262' title='bbox 828 1734 1086 1768; x_wconf 63'>recording~while</span> <span class='ocrx_word' id='word_1_263' title='bbox 1096 1742 1150 1767; x_wconf 89'>you</span> 
+     </span>
+     <span class='ocr_line' id='line_1_31' title="bbox 346 1773 1203 1808; baseline 0.001 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_264' title='bbox 346 1774 448 1806; x_wconf 86'>record,</span> <span class='ocrx_word' id='word_1_265' title='bbox 460 1774 506 1801; x_wconf 87'>the</span> <span class='ocrx_word' id='word_1_266' title='bbox 517 1773 662 1801; x_wconf 64'>first‘track</span> <span class='ocrx_word' id='word_1_267' title='bbox 673 1774 726 1801; x_wconf 91'>will</span> <span class='ocrx_word' id='word_1_268' title='bbox 736 1774 799 1807; x_wconf 89'>play</span> <span class='ocrx_word' id='word_1_269' title='bbox 809 1774 836 1801; x_wconf 91'>in</span> <span class='ocrx_word' id='word_1_270' title='bbox 847 1774 949 1808; x_wconf 84'>perfect</span> <span class='ocrx_word' id='word_1_271' title='bbox 961 1782 1026 1808; x_wconf 87'>sync</span> <span class='ocrx_word' id='word_1_272' title='bbox 1037 1774 1137 1808; x_wconf 89'>(unless</span> <span class='ocrx_word' id='word_1_273' title='bbox 1148 1782 1203 1807; x_wconf 93'>you</span> 
+     </span>
+     <span class='ocr_line' id='line_1_32' title="bbox 346 1813 1191 1847; baseline 0.002 -8; x_size 33; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_274' title='bbox 346 1813 454 1840; x_wconf 86'>MUTE</span> <span class='ocrx_word' id='word_1_275' title='bbox 464 1813 492 1845; x_wconf 88'>it,</span> <span class='ocrx_word' id='word_1_276' title='bbox 505 1821 537 1840; x_wconf 84'>or</span> <span class='ocrx_word' id='word_1_277' title='bbox 547 1813 642 1840; x_wconf 88'>SOLO</span> <span class='ocrx_word' id='word_1_278' title='bbox 653 1814 769 1841; x_wconf 87'>another</span> <span class='ocrx_word' id='word_1_279' title='bbox 779 1814 875 1847; x_wconf 86'>track).</span> <span class='ocrx_word' id='word_1_280' title='bbox 889 1814 920 1840; x_wconf 86'>In</span> <span class='ocrx_word' id='word_1_281' title='bbox 930 1813 984 1841; x_wconf 86'>this</span> <span class='ocrx_word' id='word_1_282' title='bbox 995 1822 1057 1847; x_wconf 87'>way,</span> <span class='ocrx_word' id='word_1_283' title='bbox 1069 1822 1106 1847; x_wconf 88'>up</span> <span class='ocrx_word' id='word_1_284' title='bbox 1117 1818 1146 1841; x_wconf 77'>to</span> <span class='ocrx_word' id='word_1_285' title='bbox 1158 1814 1191 1841; x_wconf 90'>32</span> 
+     </span>
+     <span class='ocr_line' id='line_1_33' title="bbox 346 1852 1205 1885; baseline 0.001 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_286' title='bbox 346 1852 434 1879; x_wconf 84'>tracks</span> <span class='ocrx_word' id='word_1_287' title='bbox 445 1860 508 1885; x_wconf 90'>may</span> <span class='ocrx_word' id='word_1_288' title='bbox 518 1853 552 1879; x_wconf 93'>be</span> <span class='ocrx_word' id='word_1_289' title='bbox 562 1853 748 1880; x_wconf 90'>overdubbed!</span> <span class='ocrx_word' id='word_1_290' title='bbox 761 1853 808 1880; x_wconf 92'>All</span> <span class='ocrx_word' id='word_1_291' title='bbox 819 1854 905 1880; x_wconf 81'>MIDI</span> <span class='ocrx_word' id='word_1_292' title='bbox 917 1853 1011 1880; x_wconf 81'>effects</span> <span class='ocrx_word' id='word_1_293' title='bbox 1022 1861 1067 1880; x_wconf 86'>are</span> <span class='ocrx_word' id='word_1_294' title='bbox 1076 1853 1205 1880; x_wconf 87'>recorded</span> 
+     </span>
+     <span class='ocr_line' id='line_1_34' title="bbox 346 1891 1168 1926; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_295' title='bbox 346 1891 485 1925; x_wconf 84'>including</span> <span class='ocrx_word' id='word_1_296' title='bbox 495 1891 570 1925; x_wconf 87'>pitch</span> <span class='ocrx_word' id='word_1_297' title='bbox 580 1892 663 1924; x_wconf 84'>bend,</span> <span class='ocrx_word' id='word_1_298' title='bbox 675 1892 859 1924; x_wconf 86'>modulation,</span> <span class='ocrx_word' id='word_1_299' title='bbox 872 1892 991 1926; x_wconf 83'>velocity,</span> <span class='ocrx_word' id='word_1_300' title='bbox 1004 1892 1168 1924; x_wconf 85'>aftertouch,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_35' title="bbox 346 1931 895 1965; baseline 0.002 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_301' title='bbox 346 1931 448 1958; x_wconf 88'>sustain</span> <span class='ocrx_word' id='word_1_302' title='bbox 459 1931 549 1965; x_wconf 88'>pedal,</span> <span class='ocrx_word' id='word_1_303' title='bbox 561 1932 617 1959; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_304' title='bbox 628 1940 756 1965; x_wconf 88'>program</span> <span class='ocrx_word' id='word_1_305' title='bbox 766 1932 895 1965; x_wconf 87'>changes!</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_15' title="bbox 346 1998 1212 2163">
+    <p class='ocr_par' id='par_1_19' lang='eng' title="bbox 346 1998 479 2040">
+     <span class='ocr_line' id='line_1_36' title="bbox 346 1998 479 2040; baseline -0.008 -9; x_size 43; x_descenders 10; x_ascenders 11"><span class='ocrx_word' id='word_1_306' title='bbox 346 1998 479 2040; x_wconf 87'>Editing</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_20' lang='eng' title="bbox 346 2050 1212 2163">
+     <span class='ocr_line' id='line_1_37' title="bbox 383 2050 1186 2084; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_307' title='bbox 383 2050 419 2076; x_wconf 89'>To</span> <span class='ocrx_word' id='word_1_308' title='bbox 430 2057 503 2076; x_wconf 87'>erase</span> <span class='ocrx_word' id='word_1_309' title='bbox 514 2058 530 2077; x_wconf 91'>a</span> <span class='ocrx_word' id='word_1_310' title='bbox 540 2058 634 2083; x_wconf 88'>wrong</span> <span class='ocrx_word' id='word_1_311' title='bbox 644 2054 717 2082; x_wconf 84'>note,</span> <span class='ocrx_word' id='word_1_312' title='bbox 729 2050 829 2083; x_wconf 89'>simply</span> <span class='ocrx_word' id='word_1_313' title='bbox 839 2050 905 2077; x_wconf 88'>hold</span> <span class='ocrx_word' id='word_1_314' title='bbox 916 2051 1037 2077; x_wconf 85'>ERASE</span> <span class='ocrx_word' id='word_1_315' title='bbox 1048 2050 1103 2077; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_316' title='bbox 1113 2059 1186 2084; x_wconf 89'>press</span> 
+     </span>
+     <span class='ocr_line' id='line_1_38' title="bbox 346 2089 1212 2124; baseline 0.002 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_317' title='bbox 346 2089 391 2116; x_wconf 86'>the</span> <span class='ocrx_word' id='word_1_318' title='bbox 402 2094 465 2117; x_wconf 86'>note</span> <span class='ocrx_word' id='word_1_319' title='bbox 475 2094 504 2117; x_wconf 86'>to</span> <span class='ocrx_word' id='word_1_320' title='bbox 515 2090 549 2117; x_wconf 93'>be</span> <span class='ocrx_word' id='word_1_321' title='bbox 559 2090 652 2117; x_wconf 89'>erased</span> <span class='ocrx_word' id='word_1_322' title='bbox 661 2090 718 2123; x_wconf 91'>just</span> <span class='ocrx_word' id='word_1_323' title='bbox 729 2090 822 2117; x_wconf 85'>before</span> <span class='ocrx_word' id='word_1_324' title='bbox 833 2090 852 2117; x_wconf 89'>it</span> <span class='ocrx_word' id='word_1_325' title='bbox 862 2090 937 2124; x_wconf 87'>plays</span> <span class='ocrx_word' id='word_1_326' title='bbox 947 2090 975 2117; x_wconf 92'>in</span> <span class='ocrx_word' id='word_1_327' title='bbox 986 2090 1032 2118; x_wconf 87'>the</span> <span class='ocrx_word' id='word_1_328' title='bbox 1043 2098 1212 2124; x_wconf 78'>sequence—</span> 
+     </span>
+     <span class='ocr_line' id='line_1_39' title="bbox 346 2129 1134 2163; baseline 0.003 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_329' title='bbox 346 2129 425 2156; x_wconf 92'>when</span> <span class='ocrx_word' id='word_1_330' title='bbox 435 2129 531 2162; x_wconf 91'>played</span> <span class='ocrx_word' id='word_1_331' title='bbox 542 2129 621 2161; x_wconf 82'>back,</span> <span class='ocrx_word' id='word_1_332' title='bbox 633 2129 652 2156; x_wconf 84'>it</span> <span class='ocrx_word' id='word_1_333' title='bbox 663 2129 716 2156; x_wconf 89'>will</span> <span class='ocrx_word' id='word_1_334' title='bbox 726 2130 760 2157; x_wconf 88'>be</span> <span class='ocrx_word' id='word_1_335' title='bbox 771 2138 849 2163; x_wconf 86'>gone.</span> <span class='ocrx_word' id='word_1_336' title='bbox 861 2131 947 2157; x_wconf 86'>Notes</span> <span class='ocrx_word' id='word_1_337' title='bbox 958 2138 1021 2163; x_wconf 88'>may</span> <span class='ocrx_word' id='word_1_338' title='bbox 1031 2130 1089 2157; x_wconf 87'>also</span> <span class='ocrx_word' id='word_1_339' title='bbox 1100 2130 1134 2157; x_wconf 91'>be</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_16' title="bbox 345 2168 1228 2242">
+    <p class='ocr_par' id='par_1_21' lang='eng' title="bbox 345 2168 1228 2242">
+     <span class='ocr_line' id='line_1_40' title="bbox 346 2168 1220 2203; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_340' title='bbox 346 2168 445 2200; x_wconf 86'>added,</span> <span class='ocrx_word' id='word_1_341' title='bbox 457 2168 560 2200; x_wconf 87'>erased,</span> <span class='ocrx_word' id='word_1_342' title='bbox 572 2177 604 2196; x_wconf 93'>or</span> <span class='ocrx_word' id='word_1_343' title='bbox 614 2169 739 2202; x_wconf 82'>changed</span> <span class='ocrx_word' id='word_1_344' title='bbox 749 2169 829 2203; x_wconf 86'>using</span> <span class='ocrx_word' id='word_1_345' title='bbox 839 2169 885 2196; x_wconf 85'>the</span> <span class='ocrx_word' id='word_1_346' title='bbox 896 2170 1031 2196; x_wconf 89'>SINGLE</span> <span class='ocrx_word' id='word_1_347' title='bbox 1042 2170 1131 2196; x_wconf 87'>STEP</span> <span class='ocrx_word' id='word_1_348' title='bbox 1143 2169 1220 2196; x_wconf 82'>func-</span> 
+     </span>
+     <span class='ocr_line' id='line_1_41' title="bbox 345 2207 1228 2242; baseline 0.002 -8; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_349' title='bbox 345 2207 412 2234; x_wconf 87'>tion.</span> <span class='ocrx_word' id='word_1_350' title='bbox 424 2208 461 2235; x_wconf 88'>To</span> <span class='ocrx_word' id='word_1_351' title='bbox 472 2208 592 2235; x_wconf 88'>overdub</span> <span class='ocrx_word' id='word_1_352' title='bbox 603 2212 680 2235; x_wconf 84'>notes</span> <span class='ocrx_word' id='word_1_353' title='bbox 691 2212 718 2235; x_wconf 89'>at</span> <span class='ocrx_word' id='word_1_354' title='bbox 729 2208 841 2242; x_wconf 83'>specific</span> <span class='ocrx_word' id='word_1_355' title='bbox 851 2209 943 2242; x_wconf 89'>points</span> <span class='ocrx_word' id='word_1_356' title='bbox 955 2208 1049 2236; x_wconf 87'>within</span> <span class='ocrx_word' id='word_1_357' title='bbox 1060 2217 1076 2236; x_wconf 87'>a</span> <span class='ocrx_word' id='word_1_358' title='bbox 1086 2216 1228 2242; x_wconf 86'>sequence,</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_17' title="bbox 345 2293 705 2326">
+    <p class='ocr_par' id='par_1_22' lang='eng' title="bbox 345 2293 705 2326">
+     <span class='ocr_line' id='line_1_42' title="bbox 345 2293 705 2326; baseline 0.003 -1; x_size 38.38298; x_descenders 5.3829789; x_ascenders 10"><span class='ocrx_word' id='word_1_359' title='bbox 345 2293 541 2326; x_wconf 86'>Additional</span> <span class='ocrx_word' id='word_1_360' title='bbox 553 2293 705 2326; x_wconf 83'>Features</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_18' title="bbox 1295 1289 2165 1593">
+    <p class='ocr_par' id='par_1_23' lang='eng' title="bbox 1296 1289 2165 1362">
+     <span class='ocr_line' id='line_1_43' title="bbox 1296 1289 2165 1322; baseline 0.001 -7; x_size 35.040108; x_descenders 6.9264708; x_ascenders 8.613636"><span class='ocrx_word' id='word_1_361' title='bbox 1296 1289 1394 1322; x_wconf 91'>simply</span> <span class='ocrx_word' id='word_1_362' title='bbox 1404 1297 1452 1316; x_wconf 87'>use</span> <span class='ocrx_word' id='word_1_363' title='bbox 1463 1290 1615 1321; x_wconf 86'>LOCATE,</span> <span class='ocrx_word' id='word_1_364' title='bbox 1628 1290 1716 1316; x_wconf 88'>FAST</span> <span class='ocrx_word' id='word_1_365' title='bbox 1726 1289 1917 1321; x_wconf 86'>FORWARD,</span> <span class='ocrx_word' id='word_1_366' title='bbox 1929 1297 1960 1317; x_wconf 92'>or</span> <span class='ocrx_word' id='word_1_367' title='bbox 1972 1290 2126 1316; x_wconf 91'>REWIND</span> <span class='ocrx_word' id='word_1_368' title='bbox 2136 1294 2165 1317; x_wconf 82'>to</span> 
+     </span>
+     <span class='ocr_line' id='line_1_44' title="bbox 1297 1328 2033 1362; baseline 0.001 -7; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_369' title='bbox 1297 1328 1356 1355; x_wconf 77'>find</span> <span class='ocrx_word' id='word_1_370' title='bbox 1366 1329 1412 1355; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_371' title='bbox 1423 1328 1527 1356; x_wconf 85'>desired</span> <span class='ocrx_word' id='word_1_372' title='bbox 1537 1329 1587 1356; x_wconf 88'>bar</span> <span class='ocrx_word' id='word_1_373' title='bbox 1598 1329 1720 1361; x_wconf 86'>number,</span> <span class='ocrx_word' id='word_1_374' title='bbox 1732 1329 1798 1356; x_wconf 78'>then</span> <span class='ocrx_word' id='word_1_375' title='bbox 1809 1333 1874 1356; x_wconf 87'>start</span> <span class='ocrx_word' id='word_1_376' title='bbox 1885 1329 2033 1362; x_wconf 85'>recording.</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_24' lang='eng' title="bbox 1295 1368 2160 1593">
+     <span class='ocr_line' id='line_1_45' title="bbox 1332 1368 2160 1402; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_377' title='bbox 1332 1368 1391 1395; x_wconf 90'>The</span> <span class='ocrx_word' id='word_1_378' title='bbox 1402 1368 1650 1395; x_wconf 86'>INSERT/COPY</span> <span class='ocrx_word' id='word_1_379' title='bbox 1662 1368 1789 1395; x_wconf 81'>function</span> <span class='ocrx_word' id='word_1_380' title='bbox 1800 1368 1893 1395; x_wconf 90'>allows</span> <span class='ocrx_word' id='word_1_381' title='bbox 1904 1376 1958 1402; x_wconf 91'>you</span> <span class='ocrx_word' id='word_1_382' title='bbox 1968 1373 1997 1395; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_383' title='bbox 2008 1377 2087 1396; x_wconf 91'>move</span> <span class='ocrx_word' id='word_1_384' title='bbox 2097 1369 2160 1396; x_wconf 89'>bars</span> 
+     </span>
+     <span class='ocr_line' id='line_1_46' title="bbox 1297 1407 2151 1441; baseline 0.002 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_385' title='bbox 1297 1407 1369 1434; x_wconf 86'>from</span> <span class='ocrx_word' id='word_1_386' title='bbox 1380 1415 1433 1434; x_wconf 88'>one</span> <span class='ocrx_word' id='word_1_387' title='bbox 1443 1407 1565 1435; x_wconf 85'>location</span> <span class='ocrx_word' id='word_1_388' title='bbox 1576 1411 1605 1434; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_389' title='bbox 1616 1407 1796 1435; x_wconf 85'>another—in</span> <span class='ocrx_word' id='word_1_390' title='bbox 1806 1408 1852 1435; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_391' title='bbox 1863 1416 1937 1435; x_wconf 90'>same</span> <span class='ocrx_word' id='word_1_392' title='bbox 1948 1416 2083 1441; x_wconf 88'>sequence</span> <span class='ocrx_word' id='word_1_393' title='bbox 2093 1416 2125 1435; x_wconf 90'>or</span> <span class='ocrx_word' id='word_1_394' title='bbox 2135 1416 2151 1435; x_wconf 88'>a</span> 
+     </span>
+     <span class='ocr_line' id='line_1_47' title="bbox 1296 1447 2160 1481; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_395' title='bbox 1296 1447 1421 1474; x_wconf 81'>different</span> <span class='ocrx_word' id='word_1_396' title='bbox 1431 1455 1491 1474; x_wconf 89'>one.</span> <span class='ocrx_word' id='word_1_397' title='bbox 1504 1448 1555 1474; x_wconf 87'>For</span> <span class='ocrx_word' id='word_1_398' title='bbox 1565 1448 1698 1481; x_wconf 84'>example,</span> <span class='ocrx_word' id='word_1_399' title='bbox 1710 1456 1764 1481; x_wconf 91'>you</span> <span class='ocrx_word' id='word_1_400' title='bbox 1775 1448 1863 1481; x_wconf 84'>might</span> <span class='ocrx_word' id='word_1_401' title='bbox 1873 1448 1955 1475; x_wconf 86'>insert</span> <span class='ocrx_word' id='word_1_402' title='bbox 1966 1456 1983 1475; x_wconf 92'>a</span> <span class='ocrx_word' id='word_1_403' title='bbox 1993 1456 2064 1481; x_wconf 88'>copy</span> <span class='ocrx_word' id='word_1_404' title='bbox 2074 1448 2106 1475; x_wconf 90'>of</span> <span class='ocrx_word' id='word_1_405' title='bbox 2115 1448 2160 1475; x_wconf 90'>the</span> 
+     </span>
+     <span class='ocr_line' id='line_1_48' title="bbox 1297 1486 2087 1521; baseline 0 -7; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_406' title='bbox 1297 1486 1355 1514; x_wconf 82'>first</span> <span class='ocrx_word' id='word_1_407' title='bbox 1366 1495 1439 1514; x_wconf 89'>verse</span> <span class='ocrx_word' id='word_1_408' title='bbox 1449 1487 1571 1514; x_wconf 89'>between</span> <span class='ocrx_word' id='word_1_409' title='bbox 1582 1487 1628 1514; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_410' title='bbox 1638 1487 1740 1514; x_wconf 87'>second</span> <span class='ocrx_word' id='word_1_411' title='bbox 1751 1487 1852 1514; x_wconf 83'>chorus</span> <span class='ocrx_word' id='word_1_412' title='bbox 1863 1487 1919 1514; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_413' title='bbox 1929 1487 1975 1514; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_414' title='bbox 1985 1487 2087 1521; x_wconf 85'>bridge.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_49' title="bbox 1296 1527 2047 1560; baseline 0.003 -8; x_size 32; x_descenders 6; x_ascenders 7"><span class='ocrx_word' id='word_1_415' title='bbox 1296 1527 1441 1553; x_wconf 88'>DELETE</span> <span class='ocrx_word' id='word_1_416' title='bbox 1453 1527 1546 1553; x_wconf 90'>BARS</span> <span class='ocrx_word' id='word_1_417' title='bbox 1557 1531 1681 1559; x_wconf 84'>operates</span> <span class='ocrx_word' id='word_1_418' title='bbox 1691 1527 1737 1553; x_wconf 86'>the</span> <span class='ocrx_word' id='word_1_419' title='bbox 1748 1535 1823 1554; x_wconf 90'>same</span> <span class='ocrx_word' id='word_1_420' title='bbox 1833 1535 1891 1560; x_wconf 93'>way</span> <span class='ocrx_word' id='word_1_421' title='bbox 1901 1531 1930 1554; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_422' title='bbox 1940 1535 2047 1554; x_wconf 90'>remove</span> 
+     </span>
+     <span class='ocr_line' id='line_1_50' title="bbox 1295 1565 1577 1593; baseline 0.004 -1; x_size 34.748871; x_descenders 6.7488689; x_ascenders 9"><span class='ocrx_word' id='word_1_423' title='bbox 1295 1565 1441 1592; x_wconf 88'>unwanted</span> <span class='ocrx_word' id='word_1_424' title='bbox 1452 1565 1577 1593; x_wconf 84'>sections.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_19' title="bbox 1295 1638 2215 1960">
+    <p class='ocr_par' id='par_1_25' lang='eng' title="bbox 1296 1638 1589 1680">
+     <span class='ocr_line' id='line_1_51' title="bbox 1296 1638 1589 1680; baseline 0 -9; x_size 42; x_descenders 9; x_ascenders 10"><span class='ocrx_word' id='word_1_425' title='bbox 1296 1638 1452 1680; x_wconf 86'>Creating</span> <span class='ocrx_word' id='word_1_426' title='bbox 1465 1648 1485 1671; x_wconf 85'>a</span> <span class='ocrx_word' id='word_1_427' title='bbox 1497 1639 1589 1680; x_wconf 87'>Song</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_26' lang='eng' title="bbox 1295 1690 2215 1960">
+     <span class='ocr_line' id='line_1_52' title="bbox 1333 1690 2146 1723; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_428' title='bbox 1333 1690 1394 1717; x_wconf 88'>One</span> <span class='ocrx_word' id='word_1_429' title='bbox 1404 1698 1462 1723; x_wconf 93'>way</span> <span class='ocrx_word' id='word_1_430' title='bbox 1472 1694 1500 1717; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_431' title='bbox 1511 1694 1598 1717; x_wconf 88'>create</span> <span class='ocrx_word' id='word_1_432' title='bbox 1608 1698 1625 1717; x_wconf 88'>a</span> <span class='ocrx_word' id='word_1_433' title='bbox 1635 1698 1704 1723; x_wconf 83'>song</span> <span class='ocrx_word' id='word_1_434' title='bbox 1715 1690 1736 1717; x_wconf 90'>is</span> <span class='ocrx_word' id='word_1_435' title='bbox 1747 1694 1776 1717; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_436' title='bbox 1787 1690 1880 1717; x_wconf 86'>record</span> <span class='ocrx_word' id='word_1_437' title='bbox 1891 1690 1958 1717; x_wconf 89'>each</span> <span class='ocrx_word' id='word_1_438' title='bbox 1969 1690 2044 1717; x_wconf 87'>track</span> <span class='ocrx_word' id='word_1_439' title='bbox 2056 1690 2090 1717; x_wconf 89'>all</span> <span class='ocrx_word' id='word_1_440' title='bbox 2101 1690 2146 1717; x_wconf 88'>the</span> 
+     </span>
+     <span class='ocr_line' id='line_1_53' title="bbox 1295 1729 2121 1762; baseline 0.001 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_441' title='bbox 1295 1737 1353 1762; x_wconf 87'>way</span> <span class='ocrx_word' id='word_1_442' title='bbox 1362 1729 1481 1762; x_wconf 83'>through</span> <span class='ocrx_word' id='word_1_443' title='bbox 1493 1729 1541 1762; x_wconf 90'>(up</span> <span class='ocrx_word' id='word_1_444' title='bbox 1552 1733 1581 1756; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_445' title='bbox 1592 1730 1644 1756; x_wconf 89'>999</span> <span class='ocrx_word' id='word_1_446' title='bbox 1654 1729 1738 1762; x_wconf 90'>bars).</span> <span class='ocrx_word' id='word_1_447' title='bbox 1751 1729 1878 1757; x_wconf 89'>Another</span> <span class='ocrx_word' id='word_1_448' title='bbox 1888 1737 1945 1762; x_wconf 89'>way</span> <span class='ocrx_word' id='word_1_449' title='bbox 1956 1729 1977 1757; x_wconf 90'>is</span> <span class='ocrx_word' id='word_1_450' title='bbox 1987 1733 2016 1757; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_451' title='bbox 2027 1729 2121 1757; x_wconf 86'>record</span> 
+     </span>
+     <span class='ocr_line' id='line_1_54' title="bbox 1296 1768 2066 1802; baseline 0 -6; x_size 33; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_452' title='bbox 1296 1768 1362 1796; x_wconf 86'>each</span> <span class='ocrx_word' id='word_1_453' title='bbox 1373 1768 1448 1796; x_wconf 87'>basic</span> <span class='ocrx_word' id='word_1_454' title='bbox 1458 1768 1562 1796; x_wconf 83'>section</span> <span class='ocrx_word' id='word_1_455' title='bbox 1574 1769 1666 1802; x_wconf 89'>(verse,</span> <span class='ocrx_word' id='word_1_456' title='bbox 1679 1769 1788 1801; x_wconf 86'>chorus,</span> <span class='ocrx_word' id='word_1_457' title='bbox 1800 1769 1865 1802; x_wconf 83'>etc.)</span> <span class='ocrx_word' id='word_1_458' title='bbox 1876 1768 1904 1795; x_wconf 91'>in</span> <span class='ocrx_word' id='word_1_459' title='bbox 1914 1768 2066 1796; x_wconf 86'>individual</span> 
+     </span>
+     <span class='ocr_line' id='line_1_55' title="bbox 1296 1808 2215 1841; baseline 0 -6; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_460' title='bbox 1296 1816 1451 1841; x_wconf 85'>sequences,</span> <span class='ocrx_word' id='word_1_461' title='bbox 1463 1808 1528 1835; x_wconf 86'>then</span> <span class='ocrx_word' id='word_1_462' title='bbox 1538 1816 1587 1835; x_wconf 90'>use</span> <span class='ocrx_word' id='word_1_463' title='bbox 1597 1808 1643 1835; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_464' title='bbox 1653 1809 1799 1835; x_wconf 89'>CREATE</span> <span class='ocrx_word' id='word_1_465' title='bbox 1810 1808 1911 1835; x_wconf 89'>SONG</span> <span class='ocrx_word' id='word_1_466' title='bbox 1923 1808 2050 1836; x_wconf 85'>function</span> <span class='ocrx_word' id='word_1_467' title='bbox 2060 1812 2089 1835; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_468' title='bbox 2103 1808 2215 1836; x_wconf 87'>“chain”</span> 
+     </span>
+     <span class='ocr_line' id='line_1_56' title="bbox 1295 1847 2135 1881; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_469' title='bbox 1295 1848 1370 1874; x_wconf 91'>them</span> <span class='ocrx_word' id='word_1_470' title='bbox 1381 1848 1508 1881; x_wconf 83'>together.</span> <span class='ocrx_word' id='word_1_471' title='bbox 1521 1848 1667 1875; x_wconf 87'>CREATE</span> <span class='ocrx_word' id='word_1_472' title='bbox 1678 1848 1779 1875; x_wconf 91'>SONG</span> <span class='ocrx_word' id='word_1_473' title='bbox 1789 1847 1842 1874; x_wconf 92'>will</span> <span class='ocrx_word' id='word_1_474' title='bbox 1853 1848 1918 1875; x_wconf 86'>then</span> <span class='ocrx_word' id='word_1_475' title='bbox 1929 1848 2135 1881; x_wconf 81'>automatically</span> 
+     </span>
+     <span class='ocr_line' id='line_1_57' title="bbox 1296 1887 2162 1920; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_476' title='bbox 1296 1895 1366 1920; x_wconf 89'>copy</span> <span class='ocrx_word' id='word_1_477' title='bbox 1377 1887 1412 1914; x_wconf 88'>all</span> <span class='ocrx_word' id='word_1_478' title='bbox 1422 1887 1468 1914; x_wconf 85'>the</span> <span class='ocrx_word' id='word_1_479' title='bbox 1478 1891 1552 1920; x_wconf 86'>parts</span> <span class='ocrx_word' id='word_1_480' title='bbox 1563 1887 1621 1914; x_wconf 86'>into</span> <span class='ocrx_word' id='word_1_481' title='bbox 1632 1895 1649 1914; x_wconf 91'>a</span> <span class='ocrx_word' id='word_1_482' title='bbox 1659 1895 1718 1914; x_wconf 91'>new</span> <span class='ocrx_word' id='word_1_483' title='bbox 1729 1895 1870 1920; x_wconf 83'>sequence.</span> <span class='ocrx_word' id='word_1_484' title='bbox 1884 1887 1911 1914; x_wconf 84'>If</span> <span class='ocrx_word' id='word_1_485' title='bbox 1919 1887 2033 1919; x_wconf 89'>desired,</span> <span class='ocrx_word' id='word_1_486' title='bbox 2045 1895 2099 1920; x_wconf 92'>you</span> <span class='ocrx_word' id='word_1_487' title='bbox 2110 1895 2162 1914; x_wconf 85'>can</span> 
+     </span>
+     <span class='ocr_line' id='line_1_58' title="bbox 1296 1926 2169 1960; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_488' title='bbox 1296 1934 1361 1953; x_wconf 89'>even</span> <span class='ocrx_word' id='word_1_489' title='bbox 1372 1930 1411 1953; x_wconf 90'>set</span> <span class='ocrx_word' id='word_1_490' title='bbox 1422 1926 1468 1953; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_491' title='bbox 1478 1926 1528 1953; x_wconf 89'>last</span> <span class='ocrx_word' id='word_1_492' title='bbox 1540 1926 1590 1953; x_wconf 88'>few</span> <span class='ocrx_word' id='word_1_493' title='bbox 1601 1927 1664 1953; x_wconf 89'>bars</span> <span class='ocrx_word' id='word_1_494' title='bbox 1675 1931 1704 1954; x_wconf 85'>to</span> <span class='ocrx_word' id='word_1_495' title='bbox 1715 1931 1806 1960; x_wconf 89'>repeat</span> <span class='ocrx_word' id='word_1_496' title='bbox 1816 1926 1955 1960; x_wconf 84'>infinitely,</span> <span class='ocrx_word' id='word_1_497' title='bbox 1968 1926 2011 1954; x_wconf 86'>for</span> <span class='ocrx_word' id='word_1_498' title='bbox 2022 1935 2038 1954; x_wconf 92'>a</span> <span class='ocrx_word' id='word_1_499' title='bbox 2049 1927 2169 1954; x_wconf 83'>fadeout.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_20' title="bbox 1293 2000 2179 2242">
+    <p class='ocr_par' id='par_1_27' lang='eng' title="bbox 1294 2000 1948 2040">
+     <span class='ocr_line' id='line_1_59' title="bbox 1294 2000 1948 2040; baseline 0.002 -8; x_size 40; x_descenders 8; x_ascenders 10"><span class='ocrx_word' id='word_1_500' title='bbox 1294 2000 1532 2040; x_wconf 84'>Composition</span> <span class='ocrx_word' id='word_1_501' title='bbox 1544 2000 1699 2033; x_wconf 85'>Without</span> <span class='ocrx_word' id='word_1_502' title='bbox 1711 2000 1948 2040; x_wconf 85'>Compromise</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_28' lang='eng' title="bbox 1293 2051 2179 2242">
+     <span class='ocr_line' id='line_1_60' title="bbox 1331 2051 2179 2085; baseline 0 -7; x_size 34; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_503' title='bbox 1331 2051 1389 2078; x_wconf 90'>The</span> <span class='ocrx_word' id='word_1_504' title='bbox 1399 2051 1563 2085; x_wconf 83'>technology</span> <span class='ocrx_word' id='word_1_505' title='bbox 1573 2059 1627 2084; x_wconf 92'>you</span> <span class='ocrx_word' id='word_1_506' title='bbox 1638 2060 1686 2079; x_wconf 86'>use</span> <span class='ocrx_word' id='word_1_507' title='bbox 1697 2051 1797 2078; x_wconf 89'>should</span> <span class='ocrx_word' id='word_1_508' title='bbox 1808 2059 1887 2078; x_wconf 87'>never</span> <span class='ocrx_word' id='word_1_509' title='bbox 1897 2052 1932 2079; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_510' title='bbox 1942 2059 1973 2079; x_wconf 89'>so</span> <span class='ocrx_word' id='word_1_511' title='bbox 1984 2051 2110 2085; x_wconf 85'>complex</span> <span class='ocrx_word' id='word_1_512' title='bbox 2120 2052 2179 2078; x_wconf 86'>that</span> 
+     </span>
+     <span class='ocr_line' id='line_1_61' title="bbox 1294 2090 2157 2124; baseline 0 -6; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_513' title='bbox 1294 2090 1313 2118; x_wconf 86'>it</span> <span class='ocrx_word' id='word_1_514' title='bbox 1323 2091 1459 2118; x_wconf 87'>interferes</span> <span class='ocrx_word' id='word_1_515' title='bbox 1470 2091 1535 2118; x_wconf 84'>with</span> <span class='ocrx_word' id='word_1_516' title='bbox 1545 2091 1591 2118; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_517' title='bbox 1602 2091 1715 2118; x_wconf 90'>creative</span> <span class='ocrx_word' id='word_1_518' title='bbox 1725 2099 1841 2124; x_wconf 83'>process.</span> <span class='ocrx_word' id='word_1_519' title='bbox 1854 2091 1947 2118; x_wconf 78'>That’s</span> <span class='ocrx_word' id='word_1_520' title='bbox 1957 2091 2086 2124; x_wconf 86'>precisely</span> <span class='ocrx_word' id='word_1_521' title='bbox 2096 2091 2157 2124; x_wconf 89'>why</span> 
+     </span>
+     <span class='ocr_line' id='line_1_62' title="bbox 1293 2130 2156 2164; baseline 0 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_522' title='bbox 1293 2130 1339 2157; x_wconf 90'>the</span> <span class='ocrx_word' id='word_1_523' title='bbox 1350 2130 1576 2164; x_wconf 80'>LinnSequencer</span> <span class='ocrx_word' id='word_1_524' title='bbox 1586 2130 1607 2157; x_wconf 89'>is</span> <span class='ocrx_word' id='word_1_525' title='bbox 1619 2130 1747 2164; x_wconf 87'>designed</span> <span class='ocrx_word' id='word_1_526' title='bbox 1758 2134 1787 2157; x_wconf 87'>to</span> <span class='ocrx_word' id='word_1_527' title='bbox 1798 2130 1834 2157; x_wconf 89'>let</span> <span class='ocrx_word' id='word_1_528' title='bbox 1844 2138 1899 2163; x_wconf 93'>you</span> <span class='ocrx_word' id='word_1_529' title='bbox 1910 2138 2051 2164; x_wconf 88'>compose,</span> <span class='ocrx_word' id='word_1_530' title='bbox 2063 2130 2156 2157; x_wconf 87'>record</span> 
+     </span>
+     <span class='ocr_line' id='line_1_63' title="bbox 1294 2169 2145 2203; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_531' title='bbox 1294 2170 1349 2197; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_532' title='bbox 1360 2169 1414 2197; x_wconf 83'>edit</span> <span class='ocrx_word' id='word_1_533' title='bbox 1425 2170 1503 2197; x_wconf 89'>while</span> <span class='ocrx_word' id='word_1_534' title='bbox 1514 2170 1643 2203; x_wconf 90'>devoting</span> <span class='ocrx_word' id='word_1_535' title='bbox 1653 2178 1721 2203; x_wconf 92'>your</span> <span class='ocrx_word' id='word_1_536' title='bbox 1731 2170 1882 2197; x_wconf 88'>undivided</span> <span class='ocrx_word' id='word_1_537' title='bbox 1893 2170 2027 2197; x_wconf 86'>attention</span> <span class='ocrx_word' id='word_1_538' title='bbox 2037 2174 2067 2197; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_539' title='bbox 2077 2178 2145 2203; x_wconf 90'>your</span> 
+     </span>
+     <span class='ocr_line' id='line_1_64' title="bbox 1294 2209 2126 2242; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_540' title='bbox 1294 2209 1388 2236; x_wconf 88'>music.</span> <span class='ocrx_word' id='word_1_541' title='bbox 1402 2209 1451 2236; x_wconf 89'>See</span> <span class='ocrx_word' id='word_1_542' title='bbox 1460 2217 1529 2242; x_wconf 92'>your</span> <span class='ocrx_word' id='word_1_543' title='bbox 1540 2209 1611 2236; x_wconf 87'>Linn</span> <span class='ocrx_word' id='word_1_544' title='bbox 1621 2209 1712 2236; x_wconf 86'>dealer</span> <span class='ocrx_word' id='word_1_545' title='bbox 1722 2209 1806 2242; x_wconf 85'>today</span> <span class='ocrx_word' id='word_1_546' title='bbox 1817 2209 1859 2236; x_wconf 87'>for</span> <span class='ocrx_word' id='word_1_547' title='bbox 1870 2217 1887 2236; x_wconf 88'>a</span> <span class='ocrx_word' id='word_1_548' title='bbox 1897 2209 2126 2236; x_wconf 76'>demonstration!</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_21' title="bbox 347 2343 2171 2378">
+    <p class='ocr_par' id='par_1_29' lang='eng' title="bbox 347 2343 2171 2378">
+     <span class='ocr_line' id='line_1_65' title="bbox 347 2343 2171 2378; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_549' title='bbox 347 2350 361 2363; x_wconf 69'><strong>0</strong></span> <span class='ocrx_word' id='word_1_550' title='bbox 373 2343 483 2377; x_wconf 83'>Simple,</span> <span class='ocrx_word' id='word_1_551' title='bbox 495 2352 559 2377; x_wconf 89'>easy</span> <span class='ocrx_word' id='word_1_552' title='bbox 569 2348 598 2371; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_553' title='bbox 609 2344 683 2371; x_wconf 89'>learn</span> <span class='ocrx_word' id='word_1_554' title='bbox 694 2344 922 2378; x_wconf 80'>operation—the</span> <span class='ocrx_word' id='word_1_555' title='bbox 934 2345 967 2372; x_wconf 88'>32</span> <span class='ocrx_word' id='word_1_556' title='bbox 978 2345 1116 2372; x_wconf 86'>character</span> <span class='ocrx_word' id='word_1_557' title='bbox 1126 2345 1200 2372; x_wconf 92'>LCD</span> <span class='ocrx_word' id='word_1_558' title='bbox 1211 2345 1316 2378; x_wconf 90'>display</span> <span class='ocrx_word' id='word_1_559' title='bbox 1326 2345 1424 2378; x_wconf 88'>clearly</span> <span class='ocrx_word' id='word_1_560' title='bbox 1434 2345 1528 2378; x_wconf 86'>guides</span> <span class='ocrx_word' id='word_1_561' title='bbox 1539 2353 1594 2378; x_wconf 91'>you</span> <span class='ocrx_word' id='word_1_562' title='bbox 1604 2345 1724 2378; x_wconf 87'>through</span> <span class='ocrx_word' id='word_1_563' title='bbox 1735 2344 1770 2371; x_wconf 88'>all</span> <span class='ocrx_word' id='word_1_564' title='bbox 1781 2344 1947 2377; x_wconf 86'>operations.</span> <span class='ocrx_word' id='word_1_565' title='bbox 1961 2344 1989 2371; x_wconf 88'>If</span> <span class='ocrx_word' id='word_1_566' title='bbox 1997 2344 2112 2376; x_wconf 88'>needed,</span> <span class='ocrx_word' id='word_1_567' title='bbox 2125 2345 2171 2371; x_wconf 88'>the</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_22' title="bbox 373 2381 1083 2415">
+    <p class='ocr_par' id='par_1_30' lang='eng' title="bbox 373 2381 1083 2415">
+     <span class='ocr_line' id='line_1_66' title="bbox 373 2381 1083 2415; baseline 0.003 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_568' title='bbox 373 2381 472 2407; x_wconf 85'>HELP</span> <span class='ocrx_word' id='word_1_569' title='bbox 483 2381 583 2408; x_wconf 85'>button</span> <span class='ocrx_word' id='word_1_570' title='bbox 594 2381 711 2415; x_wconf 87'>displays</span> <span class='ocrx_word' id='word_1_571' title='bbox 722 2382 875 2409; x_wconf 89'>additional</span> <span class='ocrx_word' id='word_1_572' title='bbox 886 2382 1083 2415; x_wconf 87'>explanations.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_23' title="bbox 347 2427 2145 2507">
+    <p class='ocr_par' id='par_1_31' lang='eng' title="bbox 347 2427 2145 2507">
+     <span class='ocr_line' id='line_1_67' title="bbox 347 2427 1468 2461; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_573' title='bbox 347 2432 361 2446; x_wconf 69'><strong>0</strong></span> <span class='ocrx_word' id='word_1_574' title='bbox 373 2427 612 2454; x_wconf 88'>Non-destructive</span> <span class='ocrx_word' id='word_1_575' title='bbox 622 2427 914 2461; x_wconf 85'>recording—existing</span> <span class='ocrx_word' id='word_1_576' title='bbox 924 2432 1002 2455; x_wconf 90'>notes</span> <span class='ocrx_word' id='word_1_577' title='bbox 1013 2436 1057 2455; x_wconf 88'>are</span> <span class='ocrx_word' id='word_1_578' title='bbox 1068 2432 1116 2455; x_wconf 84'>not</span> <span class='ocrx_word' id='word_1_579' title='bbox 1127 2428 1220 2455; x_wconf 87'>erased</span> <span class='ocrx_word' id='word_1_580' title='bbox 1231 2428 1309 2455; x_wconf 91'>while</span> <span class='ocrx_word' id='word_1_581' title='bbox 1319 2428 1468 2461; x_wconf 87'>recording.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_68' title="bbox 347 2473 2145 2507; baseline 0.001 -8; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_582' title='bbox 347 2478 361 2492; x_wconf 71'><strong>0</strong></span> <span class='ocrx_word' id='word_1_583' title='bbox 372 2473 433 2500; x_wconf 90'>Two</span> <span class='ocrx_word' id='word_1_584' title='bbox 444 2473 689 2500; x_wconf 89'>FOOTSWITCH</span> <span class='ocrx_word' id='word_1_585' title='bbox 701 2474 837 2501; x_wconf 79'>INPUTS</span> <span class='ocrx_word' id='word_1_586' title='bbox 848 2481 910 2507; x_wconf 89'>may</span> <span class='ocrx_word' id='word_1_587' title='bbox 921 2473 955 2500; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_588' title='bbox 966 2473 1091 2507; x_wconf 85'>assigned</span> <span class='ocrx_word' id='word_1_589' title='bbox 1101 2478 1130 2501; x_wconf 81'>to</span> <span class='ocrx_word' id='word_1_590' title='bbox 1141 2474 1271 2507; x_wconf 84'>remotely</span> <span class='ocrx_word' id='word_1_591' title='bbox 1281 2473 1387 2501; x_wconf 86'>control</span> <span class='ocrx_word' id='word_1_592' title='bbox 1398 2482 1481 2507; x_wconf 86'>many</span> <span class='ocrx_word' id='word_1_593' title='bbox 1491 2473 1523 2501; x_wconf 90'>of</span> <span class='ocrx_word' id='word_1_594' title='bbox 1531 2474 1578 2501; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_595' title='bbox 1588 2473 1750 2506; x_wconf 82'>commonly</span> <span class='ocrx_word' id='word_1_596' title='bbox 1760 2473 1827 2500; x_wconf 88'>used</span> <span class='ocrx_word' id='word_1_597' title='bbox 1840 2473 1991 2505; x_wconf 77'>functions,</span> <span class='ocrx_word' id='word_1_598' title='bbox 2003 2473 2145 2507; x_wconf 84'>including</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_24' title="bbox 372 2510 1090 2543">
+    <p class='ocr_par' id='par_1_32' lang='eng' title="bbox 372 2510 1090 2543">
+     <span class='ocr_line' id='line_1_69' title="bbox 372 2510 1090 2543; baseline 0.001 -6; x_size 35.625; x_descenders 8.90625; x_ascenders 8.90625"><span class='ocrx_word' id='word_1_599' title='bbox 372 2510 500 2542; x_wconf 88'>ERASE,</span> <span class='ocrx_word' id='word_1_600' title='bbox 513 2511 660 2542; x_wconf 86'>REPEAT,</span> <span class='ocrx_word' id='word_1_601' title='bbox 673 2511 883 2543; x_wconf 80'>PLAY/STOP,</span> <span class='ocrx_word' id='word_1_602' title='bbox 896 2519 927 2538; x_wconf 90'>or</span> <span class='ocrx_word' id='word_1_603' title='bbox 939 2511 1090 2538; x_wconf 83'>LOCATE.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_25' title="bbox 347 2556 1768 2590">
+    <p class='ocr_par' id='par_1_33' lang='eng' title="bbox 347 2556 1768 2590">
+     <span class='ocr_line' id='line_1_70' title="bbox 347 2556 1768 2590; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_604' title='bbox 347 2561 361 2575; x_wconf 71'><strong>0</strong></span> <span class='ocrx_word' id='word_1_605' title='bbox 372 2556 433 2583; x_wconf 91'>Two</span> <span class='ocrx_word' id='word_1_606' title='bbox 443 2556 612 2583; x_wconf 83'>TRIGGER</span> <span class='ocrx_word' id='word_1_607' title='bbox 623 2556 797 2584; x_wconf 84'>OUTPUTS</span> <span class='ocrx_word' id='word_1_608' title='bbox 808 2565 871 2590; x_wconf 89'>may</span> <span class='ocrx_word' id='word_1_609' title='bbox 881 2557 915 2584; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_610' title='bbox 925 2557 1119 2590; x_wconf 84'>programmed</span> <span class='ocrx_word' id='word_1_611' title='bbox 1129 2561 1158 2584; x_wconf 93'>to</span> <span class='ocrx_word' id='word_1_612' title='bbox 1169 2561 1270 2590; x_wconf 87'>output</span> <span class='ocrx_word' id='word_1_613' title='bbox 1281 2557 1370 2590; x_wconf 88'>pulses</span> <span class='ocrx_word' id='word_1_614' title='bbox 1381 2561 1409 2584; x_wconf 92'>at</span> <span class='ocrx_word' id='word_1_615' title='bbox 1419 2565 1472 2590; x_wconf 90'>any</span> <span class='ocrx_word' id='word_1_616' title='bbox 1483 2557 1598 2584; x_wconf 86'>selected</span> <span class='ocrx_word' id='word_1_617' title='bbox 1608 2561 1673 2584; x_wconf 89'>note</span> <span class='ocrx_word' id='word_1_618' title='bbox 1683 2556 1768 2583; x_wconf 89'>value.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_26' title="bbox 347 2601 1226 2635">
+    <p class='ocr_par' id='par_1_34' lang='eng' title="bbox 347 2601 1226 2635">
+     <span class='ocr_line' id='line_1_71' title="bbox 347 2601 1226 2635; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_619' title='bbox 347 2607 361 2620; x_wconf 65'><strong>0</strong></span> <span class='ocrx_word' id='word_1_620' title='bbox 372 2601 434 2628; x_wconf 88'>Will</span> <span class='ocrx_word' id='word_1_621' title='bbox 445 2609 510 2634; x_wconf 89'>sync</span> <span class='ocrx_word' id='word_1_622' title='bbox 521 2605 549 2628; x_wconf 84'>to</span> <span class='ocrx_word' id='word_1_623' title='bbox 561 2602 690 2629; x_wconf 88'>standard</span> <span class='ocrx_word' id='word_1_624' title='bbox 701 2602 864 2629; x_wconf 86'>LinnDrum</span> <span class='ocrx_word' id='word_1_625' title='bbox 875 2610 907 2629; x_wconf 91'>or</span> <span class='ocrx_word' id='word_1_626' title='bbox 918 2602 989 2629; x_wconf 89'>Linn</span> <span class='ocrx_word' id='word_1_627' title='bbox 1000 2603 1069 2629; x_wconf 90'>9000</span> <span class='ocrx_word' id='word_1_628' title='bbox 1080 2610 1145 2635; x_wconf 87'>sync</span> <span class='ocrx_word' id='word_1_629' title='bbox 1155 2607 1226 2630; x_wconf 89'>tone.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_27' title="bbox 347 2648 2100 2727">
+    <p class='ocr_par' id='par_1_35' lang='eng' title="bbox 347 2648 2100 2727">
+     <span class='ocr_line' id='line_1_72' title="bbox 347 2648 1664 2682; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_630' title='bbox 347 2654 360 2667; x_wconf 75'>&#39;</span> <span class='ocrx_word' id='word_1_631' title='bbox 372 2648 483 2675; x_wconf 89'>Utilizes</span> <span class='ocrx_word' id='word_1_632' title='bbox 493 2648 564 2680; x_wconf 75'>ultra</span> <span class='ocrx_word' id='word_1_633' title='bbox 573 2648 744 2682; x_wconf 86'>high—speed,</span> <span class='ocrx_word' id='word_1_634' title='bbox 757 2649 772 2676; x_wconf 91'>8</span> <span class='ocrx_word' id='word_1_635' title='bbox 783 2649 862 2675; x_wconf 89'>MHz</span> <span class='ocrx_word' id='word_1_636' title='bbox 873 2649 954 2676; x_wconf 88'>80186</span> <span class='ocrx_word' id='word_1_637' title='bbox 965 2649 994 2676; x_wconf 91'>16</span> <span class='ocrx_word' id='word_1_638' title='bbox 1004 2648 1043 2676; x_wconf 90'>bit</span> <span class='ocrx_word' id='word_1_639' title='bbox 1054 2653 1197 2682; x_wconf 88'>computer</span> <span class='ocrx_word' id='word_1_640' title='bbox 1208 2649 1350 2682; x_wconf 90'>internally</span> <span class='ocrx_word' id='word_1_641' title='bbox 1361 2649 1403 2676; x_wconf 87'>for</span> <span class='ocrx_word' id='word_1_642' title='bbox 1414 2649 1502 2676; x_wconf 87'>FAST</span> <span class='ocrx_word' id='word_1_643' title='bbox 1512 2648 1664 2682; x_wconf 81'>operation.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_73' title="bbox 347 2694 2100 2727; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_644' title='bbox 347 2699 361 2713; x_wconf 70'><strong>0</strong></span> <span class='ocrx_word' id='word_1_645' title='bbox 372 2694 504 2721; x_wconf 88'>TEMPO</span> <span class='ocrx_word' id='word_1_646' title='bbox 515 2702 578 2727; x_wconf 92'>may</span> <span class='ocrx_word' id='word_1_647' title='bbox 589 2694 623 2721; x_wconf 90'>be</span> <span class='ocrx_word' id='word_1_648' title='bbox 633 2694 764 2727; x_wconf 87'>specified</span> <span class='ocrx_word' id='word_1_649' title='bbox 774 2694 802 2721; x_wconf 89'>in</span> <span class='ocrx_word' id='word_1_650' title='bbox 814 2695 1172 2722; x_wconf 84'>BEATS-PER—MINUTE</span> <span class='ocrx_word' id='word_1_651' title='bbox 1183 2703 1215 2722; x_wconf 93'>or</span> <span class='ocrx_word' id='word_1_652' title='bbox 1225 2695 1567 2722; x_wconf 84'>FRAMES-PER—BEAT</span> <span class='ocrx_word' id='word_1_653' title='bbox 1577 2698 1605 2721; x_wconf 89'>at</span> <span class='ocrx_word' id='word_1_654' title='bbox 1616 2695 1659 2726; x_wconf 91'>24,</span> <span class='ocrx_word' id='word_1_655' title='bbox 1672 2695 1716 2726; x_wconf 88'>25,</span> <span class='ocrx_word' id='word_1_656' title='bbox 1728 2702 1760 2721; x_wconf 90'>or</span> <span class='ocrx_word' id='word_1_657' title='bbox 1772 2695 1806 2721; x_wconf 88'>30</span> <span class='ocrx_word' id='word_1_658' title='bbox 1817 2694 1917 2721; x_wconf 86'>frames</span> <span class='ocrx_word' id='word_1_659' title='bbox 1928 2702 1976 2727; x_wconf 89'>per</span> <span class='ocrx_word' id='word_1_660' title='bbox 1987 2694 2100 2726; x_wconf 87'>second,</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_28' title="bbox 373 2731 652 2765">
+    <p class='ocr_par' id='par_1_36' lang='eng' title="bbox 373 2731 652 2765">
+     <span class='ocr_line' id='line_1_74' title="bbox 373 2731 652 2765; baseline 0 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_661' title='bbox 373 2731 449 2764; x_wconf 87'>(even</span> <span class='ocrx_word' id='word_1_662' title='bbox 460 2731 529 2765; x_wconf 88'>drop</span> <span class='ocrx_word' id='word_1_663' title='bbox 541 2731 652 2764; x_wconf 81'>frame!)</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_29' title="bbox 347 2777 2174 2811">
+    <p class='ocr_par' id='par_1_37' lang='eng' title="bbox 347 2777 2174 2811">
+     <span class='ocr_line' id='line_1_75' title="bbox 347 2777 2174 2811; baseline 0.001 -8; x_size 33; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_664' title='bbox 347 2782 360 2796; x_wconf 72'><strong>0</strong></span> <span class='ocrx_word' id='word_1_665' title='bbox 372 2777 504 2804; x_wconf 82'>TEMPO</span> <span class='ocrx_word' id='word_1_666' title='bbox 515 2785 578 2810; x_wconf 91'>may</span> <span class='ocrx_word' id='word_1_667' title='bbox 588 2777 622 2804; x_wconf 92'>be</span> <span class='ocrx_word' id='word_1_668' title='bbox 633 2778 741 2804; x_wconf 84'>entered</span> <span class='ocrx_word' id='word_1_669' title='bbox 751 2777 934 2811; x_wconf 80'>numerically,</span> <span class='ocrx_word' id='word_1_670' title='bbox 946 2777 1101 2811; x_wconf 85'>adjustable</span> <span class='ocrx_word' id='word_1_671' title='bbox 1111 2777 1139 2804; x_wconf 92'>in</span> <span class='ocrx_word' id='word_1_672' title='bbox 1149 2778 1239 2805; x_wconf 88'>tenths</span> <span class='ocrx_word' id='word_1_673' title='bbox 1250 2778 1282 2805; x_wconf 85'>of</span> <span class='ocrx_word' id='word_1_674' title='bbox 1290 2786 1307 2805; x_wconf 94'>a</span> <span class='ocrx_word' id='word_1_675' title='bbox 1317 2777 1567 2805; x_wconf 85'>Beat-Per-Minute</span> <span class='ocrx_word' id='word_1_676' title='bbox 1577 2777 1748 2809; x_wconf 85'>increments,</span> <span class='ocrx_word' id='word_1_677' title='bbox 1760 2785 1792 2804; x_wconf 87'>or</span> <span class='ocrx_word' id='word_1_678' title='bbox 1803 2777 1839 2810; x_wconf 94'>by</span> <span class='ocrx_word' id='word_1_679' title='bbox 1849 2777 1964 2811; x_wconf 84'>tapping</span> <span class='ocrx_word' id='word_1_680' title='bbox 1975 2781 2086 2810; x_wconf 85'>quarter</span> <span class='ocrx_word' id='word_1_681' title='bbox 2097 2781 2174 2804; x_wconf 85'>notes</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_30' title="bbox 372 2815 808 2842">
+    <p class='ocr_par' id='par_1_38' lang='eng' title="bbox 372 2815 808 2842">
+     <span class='ocr_line' id='line_1_76' title="bbox 372 2815 808 2842; baseline 0.002 -1; x_size 32.351353; x_descenders 5.3513513; x_ascenders 9"><span class='ocrx_word' id='word_1_682' title='bbox 372 2822 410 2841; x_wconf 93'>on</span> <span class='ocrx_word' id='word_1_683' title='bbox 420 2815 466 2842; x_wconf 86'>the</span> <span class='ocrx_word' id='word_1_684' title='bbox 476 2815 545 2841; x_wconf 91'>TAP</span> <span class='ocrx_word' id='word_1_685' title='bbox 556 2815 689 2842; x_wconf 85'>TEMPO</span> <span class='ocrx_word' id='word_1_686' title='bbox 699 2815 808 2842; x_wconf 83'>button.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_31' title="bbox 347 2861 1792 2940">
+    <p class='ocr_par' id='par_1_39' lang='eng' title="bbox 347 2861 1792 2940">
+     <span class='ocr_line' id='line_1_77' title="bbox 347 2861 1792 2895; baseline 0.001 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_687' title='bbox 347 2866 360 2880; x_wconf 68'><strong>0</strong></span> <span class='ocrx_word' id='word_1_688' title='bbox 372 2861 504 2887; x_wconf 87'>TEMPO</span> <span class='ocrx_word' id='word_1_689' title='bbox 515 2861 696 2888; x_wconf 86'>CHANGES</span> <span class='ocrx_word' id='word_1_690' title='bbox 707 2869 771 2894; x_wconf 92'>may</span> <span class='ocrx_word' id='word_1_691' title='bbox 781 2861 815 2888; x_wconf 92'>be</span> <span class='ocrx_word' id='word_1_692' title='bbox 825 2861 1019 2894; x_wconf 85'>programmed</span> <span class='ocrx_word' id='word_1_693' title='bbox 1030 2861 1087 2888; x_wconf 88'>into</span> <span class='ocrx_word' id='word_1_694' title='bbox 1099 2869 1115 2888; x_wconf 87'>a</span> <span class='ocrx_word' id='word_1_695' title='bbox 1126 2870 1268 2895; x_wconf 87'>sequence,</span> <span class='ocrx_word' id='word_1_696' title='bbox 1280 2861 1344 2888; x_wconf 89'>with</span> <span class='ocrx_word' id='word_1_697' title='bbox 1356 2862 1467 2888; x_wconf 88'>smooth</span> <span class='ocrx_word' id='word_1_698' title='bbox 1478 2861 1635 2888; x_wconf 85'>transitions</span> <span class='ocrx_word' id='word_1_699' title='bbox 1646 2861 1670 2887; x_wconf 90'>if</span> <span class='ocrx_word' id='word_1_700' title='bbox 1679 2861 1792 2888; x_wconf 89'>desired.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_78' title="bbox 347 2906 1507 2940; baseline 0.002 -8; x_size 33; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_701' title='bbox 347 2911 360 2925; x_wconf 74'><strong><em>°</em></strong></span> <span class='ocrx_word' id='word_1_702' title='bbox 371 2906 434 2938; x_wconf 92'>Any</span> <span class='ocrx_word' id='word_1_703' title='bbox 444 2906 539 2932; x_wconf 85'>TIME</span> <span class='ocrx_word' id='word_1_704' title='bbox 550 2906 763 2933; x_wconf 88'>SIGNATURE</span> <span class='ocrx_word' id='word_1_705' title='bbox 773 2915 836 2939; x_wconf 88'>may</span> <span class='ocrx_word' id='word_1_706' title='bbox 846 2907 880 2933; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_707' title='bbox 891 2907 968 2938; x_wconf 89'>used,</span> <span class='ocrx_word' id='word_1_708' title='bbox 980 2907 1036 2934; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_709' title='bbox 1046 2915 1109 2940; x_wconf 91'>may</span> <span class='ocrx_word' id='word_1_710' title='bbox 1120 2907 1154 2934; x_wconf 90'>be</span> <span class='ocrx_word' id='word_1_711' title='bbox 1164 2907 1288 2940; x_wconf 84'>changed</span> <span class='ocrx_word' id='word_1_712' title='bbox 1299 2907 1393 2934; x_wconf 83'>within</span> <span class='ocrx_word' id='word_1_713' title='bbox 1404 2915 1420 2934; x_wconf 89'>a</span> <span class='ocrx_word' id='word_1_714' title='bbox 1431 2915 1507 2940; x_wconf 87'>song.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_32' title="bbox 1540 2970 1878 3140">
+    <p class='ocr_par' id='par_1_40' lang='eng' title="bbox 1540 2970 1878 3140">
+     <span class='ocr_line' id='line_1_79' title="bbox 1540 2970 1800 3089; baseline 0 -14; x_size 100.5; x_descenders 16.5; x_ascenders 28.499998"><span class='ocrx_word' id='word_1_715' title='bbox 1540 2970 1800 3089; x_wconf 74'>E1111</span> 
+     </span>
+     <span class='ocr_line' id='line_1_80' title="bbox 1554 3108 1878 3140; baseline 0 -5; x_size 32; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_716' title='bbox 1554 3108 1624 3135; x_wconf 91'>Linn</span> <span class='ocrx_word' id='word_1_717' title='bbox 1635 3108 1808 3140; x_wconf 87'>Electronics,</span> <span class='ocrx_word' id='word_1_718' title='bbox 1822 3109 1878 3136; x_wconf 84'>Inc.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_33' title="bbox 1554 3150 2188 3226">
+    <p class='ocr_par' id='par_1_41' lang='eng' title="bbox 1554 3150 2188 3226">
+     <span class='ocr_line' id='line_1_81' title="bbox 1557 3150 2163 3182; baseline 0 -5; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_719' title='bbox 1557 3150 1638 3177; x_wconf 88'>18720</span> <span class='ocrx_word' id='word_1_720' title='bbox 1648 3150 1761 3177; x_wconf 89'>Oxnard</span> <span class='ocrx_word' id='word_1_721' title='bbox 1772 3150 1866 3182; x_wconf 81'>Street,</span> <span class='ocrx_word' id='word_1_722' title='bbox 1878 3150 2006 3182; x_wconf 86'>Tarzana,</span> <span class='ocrx_word' id='word_1_723' title='bbox 2019 3150 2071 3177; x_wconf 93'>CA</span> <span class='ocrx_word' id='word_1_724' title='bbox 2082 3150 2163 3177; x_wconf 88'>91356</span> 
+     </span>
+     <span class='ocr_line' id='line_1_82' title="bbox 1554 3192 2188 3226; baseline 0 -7; x_size 33.5; x_descenders 5.5; x_ascenders 8.5"><span class='ocrx_word' id='word_1_725' title='bbox 1554 3193 1622 3226; x_wconf 89'>(818)</span> <span class='ocrx_word' id='word_1_726' title='bbox 1633 3193 1755 3219; x_wconf 60'>7088131</span> <span class='ocrx_word' id='word_1_727' title='bbox 1765 3193 1788 3219; x_wconf 91'>T</span> <span class='ocrx_word' id='word_1_728' title='bbox 1789 3193 1888 3219; x_wconf 87'>ELEX</span> <span class='ocrx_word' id='word_1_729' title='bbox 1899 3192 2022 3219; x_wconf 82'>#298949</span> <span class='ocrx_word' id='word_1_730' title='bbox 2033 3193 2125 3219; x_wconf 88'>LINN</span> <span class='ocrx_word' id='word_1_731' title='bbox 2135 3193 2188 3219; x_wconf 89'>UR</span> 
+     </span>
+    </p>
+   </div>
+  </div>
+ </body>
+</html>

tests/cache/cardinal/__-l__eng__000001.ocr.png__000001__hocr__txt/stderr.bin

@@ -0,0 +1 @@
+Tesseract Open Source OCR Engine v3.05.01 with Leptonica

tests/cache/cardinal/__-l__eng__000001.ocr.png__000001__hocr__txt/txt.bin

@@ -0,0 +1,123 @@
+The LinnSequencer
+32 Track MIDI Sequence Recorder
+
+The LinnSequencer is a state—of—the-art composition and performance tool for the professional musician. It is
+
+extremely powerful, yet amazingly simple to learn and use. It’s many remarkable features include:
+
+0 Operation is similar to multi—track tape recorder with PLAY, STOP, RECORD, FAST
+FORWARD, REWIND, and LOCATE controls.
+
+0 Each of the 100 sequences contains 32 simultaneous, polyphonic tracks. Each track may
+be assigned to one of 16 MIDI channels. Simultaneously plays up to 16 polyphonic
+
+synthesizers !
+
+0 Ultra—fast 3 1/2 ” disk drive stores complex songs in seconds and holds over 110,000 notes
+
+per disk!
+
+0 One or all tracks may be TRANSPOSED at the touch of a key.
+0 Exclusive real—time ERASE function makes editing FAST.
+0 Exclusive REPEAT function automatically repeats any held notes at a pre-selected
+
+rhythmic value.
+
+0 TIMING CORRECTION works during playback and operates without ‘chopping’ notes.
+
+0 Optional SMPTE time code synchronization.
+
+0 Optional remote control.
+
+Recording 3 Sequence
+
+To record a sequence, simply press RECORD and PLAY,
+then play your MIDI keyboard in time to the Sequencer’s
+click track. When the sequence loops back around to bar 1,
+you’ll hear what you played—only all timing errors will be
+
+corrected! (Timing correction may be adjusted or defeated).
+
+Any additional notes played will be added into the track
+—existing notes are not erased while recording!
+
+FAST FORWARD, REWIND, and LOCATE controls
+may be used at any time to quickly access any location in
+your sequence for spot—recording. To overdub a new part,
+select a different track and start recording~while you
+record, the first‘track will play in perfect sync (unless you
+MUTE it, or SOLO another track). In this way, up to 32
+tracks may be overdubbed! All MIDI effects are recorded
+including pitch bend, modulation, velocity, aftertouch,
+sustain pedal, and program changes!
+
+Editing
+
+To erase a wrong note, simply hold ERASE and press
+the note to be erased just before it plays in the sequence—
+when played back, it will be gone. Notes may also be
+
+added, erased, or changed using the SINGLE STEP func-
+tion. To overdub notes at specific points within a sequence,
+
+Additional Features
+
+simply use LOCATE, FAST FORWARD, or REWIND to
+find the desired bar number, then start recording.
+
+The INSERT/COPY function allows you to move bars
+from one location to another—in the same sequence or a
+different one. For example, you might insert a copy of the
+first verse between the second chorus and the bridge.
+DELETE BARS operates the same way to remove
+unwanted sections.
+
+Creating a Song
+
+One way to create a song is to record each track all the
+way through (up to 999 bars). Another way is to record
+each basic section (verse, chorus, etc.) in individual
+sequences, then use the CREATE SONG function to “chain”
+them together. CREATE SONG will then automatically
+copy all the parts into a new sequence. If desired, you can
+even set the last few bars to repeat infinitely, for a fadeout.
+
+Composition Without Compromise
+
+The technology you use should never be so complex that
+it interferes with the creative process. That’s precisely why
+the LinnSequencer is designed to let you compose, record
+and edit while devoting your undivided attention to your
+music. See your Linn dealer today for a demonstration!
+
+0 Simple, easy to learn operation—the 32 character LCD display clearly guides you through all operations. If needed, the
+
+HELP button displays additional explanations.
+
+0 Non-destructive recording—existing notes are not erased while recording.
+0 Two FOOTSWITCH INPUTS may be assigned to remotely control many of the commonly used functions, including
+
+ERASE, REPEAT, PLAY/STOP, or LOCATE.
+
+0 Two TRIGGER OUTPUTS may be programmed to output pulses at any selected note value.
+
+0 Will sync to standard LinnDrum or Linn 9000 sync tone.
+
+' Utilizes ultra high—speed, 8 MHz 80186 16 bit computer internally for FAST operation.
+0 TEMPO may be specified in BEATS-PER—MINUTE or FRAMES-PER—BEAT at 24, 25, or 30 frames per second,
+
+(even drop frame!)
+
+0 TEMPO may be entered numerically, adjustable in tenths of a Beat-Per-Minute increments, or by tapping quarter notes
+
+on the TAP TEMPO button.
+
+0 TEMPO CHANGES may be programmed into a sequence, with smooth transitions if desired.
+° Any TIME SIGNATURE may be used, and may be changed within a song.
+
+E1111
+Linn Electronics, Inc.
+
+18720 Oxnard Street, Tarzana, CA 91356
+(818) 7088131 T ELEX #298949 LINN UR
+

tests/cache/cardinal/__-l__eng__000002.ocr.png__000002.text__pdf__txt/stderr.bin

@@ -0,0 +1 @@
+Tesseract Open Source OCR Engine v3.05.01 with Leptonica

tests/cache/cardinal/__-l__eng__000002.ocr.png__000002.text__pdf__txt/txt.bin

@@ -0,0 +1,123 @@
+The LinnSequencer
+32 Track MIDI Sequence Recorder
+
+The LinnSequencer is a state—of—the-art composition and performance tool for the professional musician. It is
+
+extremely powerful, yet amazingly simple to learn and use. It’s many remarkable features include:
+
+0 Operation is similar to multi—track tape recorder with PLAY, STOP, RECORD, FAST
+FORWARD, REWIND, and LOCATE controls.
+
+0 Each of the 100 sequences contains 32 simultaneous, polyphonic tracks. Each track may
+be assigned to one of 16 MIDI channels. Simultaneously plays up to 16 polyphonic
+
+synthesizers !
+
+0 Ultra—fast 3 1/2 ” disk drive stores complex songs in seconds and holds over 110,000 notes
+
+per disk!
+
+0 One or all tracks may be TRANSPOSED at the touch of a key.
+0 Exclusive real—time ERASE function makes editing FAST.
+0 Exclusive REPEAT function automatically repeats any held notes at a pre-selected
+
+rhythmic value.
+
+0 TIMING CORRECTION works during playback and operates without ‘chopping’ notes.
+
+0 Optional SMPTE time code synchronization.
+
+0 Optional remote control.
+
+Recording 3 Sequence
+
+To record a sequence, simply press RECORD and PLAY,
+then play your MIDI keyboard in time to the Sequencer’s
+click track. When the sequence loops back around to bar 1,
+you’ll hear what you played—only all timing errors will be
+
+corrected! (Timing correction may be adjusted or defeated).
+
+Any additional notes played will be added into the track
+—existing notes are not erased while recording!
+
+FAST FORWARD, REWIND, and LOCATE controls
+may be used at any time to quickly access any location in
+your sequence for spot—recording. To overdub a new part,
+select a different track and start recording~while you
+record, the first‘track will play in perfect sync (unless you
+MUTE it, or SOLO another track). In this way, up to 32
+tracks may be overdubbed! All MIDI effects are recorded
+including pitch bend, modulation, velocity, aftertouch,
+sustain pedal, and program changes!
+
+Editing
+
+To erase a wrong note, simply hold ERASE and press
+the note to be erased just before it plays in the sequence—
+when played back, it will be gone. Notes may also be
+
+added, erased, or changed using the SINGLE STEP func-
+tion. To overdub notes at specific points within a sequence,
+
+Additional Features
+
+simply use LOCATE, FAST FORWARD, or REWIND to
+find the desired bar number, then start recording.
+
+The INSERT/COPY function allows you to move bars
+from one location to another—in the same sequence or a
+different one. For example, you might insert a copy of the
+first verse between the second chorus and the bridge.
+DELETE BARS operates the same way to remove
+unwanted sections.
+
+Creating a Song
+
+One way to create a song is to record each track all the
+way through (up to 999 bars). Another way is to record
+each basic section (verse, chorus, etc.) in individual
+sequences, then use the CREATE SONG function to “chain”
+them together. CREATE SONG will then automatically
+copy all the parts into a new sequence. If desired, you can
+even set the last few bars to repeat infinitely, for a fadeout.
+
+Composition Without Compromise
+
+The technology you use should never be so complex that
+it interferes with the creative process. That’s precisely why
+the LinnSequencer is designed to let you compose, record
+and edit while devoting your undivided attention to your
+music. See your Linn dealer today for a demonstration!
+
+0 Simple, easy to learn operation—the 32 character LCD display clearly guides you through all operations. If needed, the
+
+HELP button displays additional explanations.
+
+0 Non-destructive recording—existing notes are not erased while recording.
+0 Two FOOTSWITCH INPUTS may be assigned to remotely control many of the commonly used functions, including
+
+ERASE, REPEAT, PLAY/STOP, or LOCATE.
+
+0 Two TRIGGER OUTPUTS may be programmed to output pulses at any selected note value.
+
+0 Will sync to standard LinnDrum or Linn 9000 sync tone.
+
+' Utilizes ultra high—speed, 8 MHz 80186 16 bit computer internally for FAST operation.
+0 TEMPO may be specified in BEATS-PER—MINUTE or FRAMES-PER—BEAT at 24, 25, or 30 frames per second,
+
+(even drop frame!)
+
+0 TEMPO may be entered numerically, adjustable in tenths of a Beat-Per-Minute increments, or by tapping quarter notes
+
+on the TAP TEMPO button.
+
+0 TEMPO CHANGES may be programmed into a sequence, with smooth transitions if desired.
+° Any TIME SIGNATURE may be used, and may be changed within a song.
+
+E1111
+Linn Electronics, Inc.
+
+18720 Oxnard Street, Tarzana, CA 91356
+(818) 7088131 T ELEX #298949 LINN UR
+

tests/cache/cardinal/__-l__eng__000002.ocr.png__000002__hocr__txt/hocr.bin

@@ -0,0 +1,335 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+ <head>
+  <title></title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+  <meta name='ocr-system' content='tesseract 3.05.01' />
+  <meta name='ocr-capabilities' content='ocr_page ocr_carea ocr_par ocr_line ocrx_word'/>
+</head>
+<body>
+  <div class='ocr_page' id='page_1' title='image "/var/folders/37/78_114p552q16vv6vmgm5kr00000gn/T/com.github.ocrmypdf.wahjk6fa/000002.ocr.png"; bbox 0 0 2550 3300; ppageno 0'>
+   <div class='ocr_carea' id='block_1_1' title="bbox 582 131 1968 303">
+    <p class='ocr_par' id='par_1_1' lang='eng' title="bbox 582 131 1968 303">
+     <span class='ocr_line' id='line_1_1' title="bbox 882 131 1657 217; baseline 0.001 -17; x_size 85; x_descenders 16; x_ascenders 19"><span class='ocrx_word' id='word_1_1' title='bbox 882 132 1036 202; x_wconf 86'>The</span> <span class='ocrx_word' id='word_1_2' title='bbox 1061 131 1657 217; x_wconf 84'>LinnSequencer</span> 
+     </span>
+     <span class='ocr_line' id='line_1_2' title="bbox 582 215 1968 303; baseline 0 -17; x_size 87; x_descenders 16; x_ascenders 21"><span class='ocrx_word' id='word_1_3' title='bbox 582 215 674 286; x_wconf 90'>32</span> <span class='ocrx_word' id='word_1_4' title='bbox 697 218 923 288; x_wconf 84'>Track</span> <span class='ocrx_word' id='word_1_5' title='bbox 948 218 1181 287; x_wconf 94'><strong>MIDI</strong></span> <span class='ocrx_word' id='word_1_6' title='bbox 1208 217 1575 303; x_wconf 89'>Sequence</span> <span class='ocrx_word' id='word_1_7' title='bbox 1600 218 1968 288; x_wconf 83'>Recorder</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_2' title="bbox 347 380 2188 574">
+    <p class='ocr_par' id='par_1_2' lang='eng' title="bbox 347 380 2188 423">
+     <span class='ocr_line' id='line_1_3' title="bbox 347 380 2188 423; baseline -0.001 -12; x_size 38; x_descenders 8; x_ascenders 10"><span class='ocrx_word' id='word_1_8' title='bbox 347 380 412 410; x_wconf 86'>The</span> <span class='ocrx_word' id='word_1_9' title='bbox 424 380 676 417; x_wconf 85'>LinnSequencer</span> <span class='ocrx_word' id='word_1_10' title='bbox 688 380 712 411; x_wconf 87'>is</span> <span class='ocrx_word' id='word_1_11' title='bbox 724 390 743 411; x_wconf 90'>a</span> <span class='ocrx_word' id='word_1_12' title='bbox 754 381 1005 423; x_wconf 79'>state—of—the-art</span> <span class='ocrx_word' id='word_1_13' title='bbox 1017 380 1226 418; x_wconf 86'>composition</span> <span class='ocrx_word' id='word_1_14' title='bbox 1238 381 1299 411; x_wconf 88'>and</span> <span class='ocrx_word' id='word_1_15' title='bbox 1311 380 1525 418; x_wconf 85'>performance</span> <span class='ocrx_word' id='word_1_16' title='bbox 1536 380 1602 411; x_wconf 85'>tool</span> <span class='ocrx_word' id='word_1_17' title='bbox 1615 380 1663 411; x_wconf 82'>for</span> <span class='ocrx_word' id='word_1_18' title='bbox 1674 381 1725 410; x_wconf 94'>the</span> <span class='ocrx_word' id='word_1_19' title='bbox 1737 380 1940 417; x_wconf 85'>professional</span> <span class='ocrx_word' id='word_1_20' title='bbox 1952 380 2112 411; x_wconf 87'>musician.</span> <span class='ocrx_word' id='word_1_21' title='bbox 2127 381 2152 410; x_wconf 90'>It</span> <span class='ocrx_word' id='word_1_22' title='bbox 2164 380 2188 410; x_wconf 90'>is</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_3' lang='eng' title="bbox 347 430 1988 468">
+     <span class='ocr_line' id='line_1_4' title="bbox 347 430 1988 468; baseline 0 -8; x_size 37; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_23' title='bbox 347 430 507 467; x_wconf 86'>extremely</span> <span class='ocrx_word' id='word_1_24' title='bbox 518 430 677 467; x_wconf 84'>powerful,</span> <span class='ocrx_word' id='word_1_25' title='bbox 691 435 739 467; x_wconf 91'>yet</span> <span class='ocrx_word' id='word_1_26' title='bbox 752 430 924 468; x_wconf 87'>amazingly</span> <span class='ocrx_word' id='word_1_27' title='bbox 936 430 1044 468; x_wconf 85'>simple</span> <span class='ocrx_word' id='word_1_28' title='bbox 1055 435 1087 461; x_wconf 87'>to</span> <span class='ocrx_word' id='word_1_29' title='bbox 1099 431 1183 461; x_wconf 88'>learn</span> <span class='ocrx_word' id='word_1_30' title='bbox 1195 431 1257 461; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_31' title='bbox 1269 440 1329 461; x_wconf 89'>use.</span> <span class='ocrx_word' id='word_1_32' title='bbox 1344 431 1393 461; x_wconf 87'>It’s</span> <span class='ocrx_word' id='word_1_33' title='bbox 1406 440 1499 467; x_wconf 91'>many</span> <span class='ocrx_word' id='word_1_34' title='bbox 1510 430 1701 461; x_wconf 88'>remarkable</span> <span class='ocrx_word' id='word_1_35' title='bbox 1714 430 1843 460; x_wconf 85'>features</span> <span class='ocrx_word' id='word_1_36' title='bbox 1856 430 1988 461; x_wconf 87'>include:</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_4' lang='eng' title="bbox 350 482 2093 574">
+     <span class='ocr_line' id='line_1_5' title="bbox 350 482 2093 527; baseline 0 -9; x_size 43; x_descenders 7; x_ascenders 11"><span class='ocrx_word' id='word_1_37' title='bbox 350 490 368 508; x_wconf 68'><strong>0</strong></span> <span class='ocrx_word' id='word_1_38' title='bbox 383 482 585 526; x_wconf 88'>Operation</span> <span class='ocrx_word' id='word_1_39' title='bbox 598 482 627 518; x_wconf 89'>is</span> <span class='ocrx_word' id='word_1_40' title='bbox 641 482 776 518; x_wconf 88'>similar</span> <span class='ocrx_word' id='word_1_41' title='bbox 789 488 829 518; x_wconf 88'>to</span> <span class='ocrx_word' id='word_1_42' title='bbox 843 482 1062 519; x_wconf 86'>multi—track</span> <span class='ocrx_word' id='word_1_43' title='bbox 1076 488 1160 527; x_wconf 92'>tape</span> <span class='ocrx_word' id='word_1_44' title='bbox 1173 483 1336 519; x_wconf 88'>recorder</span> <span class='ocrx_word' id='word_1_45' title='bbox 1350 482 1436 518; x_wconf 87'>with</span> <span class='ocrx_word' id='word_1_46' title='bbox 1451 483 1580 525; x_wconf 90'>PLAY,</span> <span class='ocrx_word' id='word_1_47' title='bbox 1598 483 1724 525; x_wconf 90'>STOP,</span> <span class='ocrx_word' id='word_1_48' title='bbox 1741 483 1957 525; x_wconf 89'>RECORD,</span> <span class='ocrx_word' id='word_1_49' title='bbox 1974 483 2093 518; x_wconf 88'>FAST</span> 
+     </span>
+     <span class='ocr_line' id='line_1_6' title="bbox 383 532 1345 574; baseline 0.001 -7; x_size 43; x_descenders 7; x_ascenders 11"><span class='ocrx_word' id='word_1_50' title='bbox 383 532 635 574; x_wconf 88'>FORWARD,</span> <span class='ocrx_word' id='word_1_51' title='bbox 652 532 865 574; x_wconf 89'>REWIND,</span> <span class='ocrx_word' id='word_1_52' title='bbox 882 532 956 568; x_wconf 91'>and</span> <span class='ocrx_word' id='word_1_53' title='bbox 971 532 1163 568; x_wconf 90'>LOCATE</span> <span class='ocrx_word' id='word_1_54' title='bbox 1177 532 1345 568; x_wconf 87'>controls.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_3' title="bbox 349 589 2136 685">
+    <p class='ocr_par' id='par_1_5' lang='eng' title="bbox 349 589 2136 685">
+     <span class='ocr_line' id='line_1_7' title="bbox 349 589 2136 634; baseline 0.001 -9; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_55' title='bbox 349 597 368 615; x_wconf 67'><strong>0</strong></span> <span class='ocrx_word' id='word_1_56' title='bbox 383 590 482 625; x_wconf 90'>Each</span> <span class='ocrx_word' id='word_1_57' title='bbox 496 589 539 625; x_wconf 87'>of</span> <span class='ocrx_word' id='word_1_58' title='bbox 549 590 611 626; x_wconf 92'>the</span> <span class='ocrx_word' id='word_1_59' title='bbox 625 590 686 625; x_wconf 91'>100</span> <span class='ocrx_word' id='word_1_60' title='bbox 700 601 895 634; x_wconf 89'>sequences</span> <span class='ocrx_word' id='word_1_61' title='bbox 909 590 1075 626; x_wconf 88'>contains</span> <span class='ocrx_word' id='word_1_62' title='bbox 1090 591 1135 626; x_wconf 89'>32</span> <span class='ocrx_word' id='word_1_63' title='bbox 1149 590 1418 633; x_wconf 87'>simultaneous,</span> <span class='ocrx_word' id='word_1_64' title='bbox 1435 590 1661 634; x_wconf 89'>polyphonic</span> <span class='ocrx_word' id='word_1_65' title='bbox 1674 590 1802 626; x_wconf 85'>tracks.</span> <span class='ocrx_word' id='word_1_66' title='bbox 1819 590 1921 626; x_wconf 89'>Each</span> <span class='ocrx_word' id='word_1_67' title='bbox 1934 590 2035 626; x_wconf 88'>track</span> <span class='ocrx_word' id='word_1_68' title='bbox 2050 600 2136 634; x_wconf 89'>may</span> 
+     </span>
+     <span class='ocr_line' id='line_1_8' title="bbox 383 639 2022 685; baseline 0.001 -10; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_69' title='bbox 383 639 428 675; x_wconf 95'>be</span> <span class='ocrx_word' id='word_1_70' title='bbox 442 639 607 684; x_wconf 88'>assigned</span> <span class='ocrx_word' id='word_1_71' title='bbox 621 645 659 676; x_wconf 92'>to</span> <span class='ocrx_word' id='word_1_72' title='bbox 674 650 745 676; x_wconf 91'>one</span> <span class='ocrx_word' id='word_1_73' title='bbox 759 640 801 676; x_wconf 84'>of</span> <span class='ocrx_word' id='word_1_74' title='bbox 813 641 851 676; x_wconf 92'>16</span> <span class='ocrx_word' id='word_1_75' title='bbox 864 641 980 675; x_wconf 90'>MIDI</span> <span class='ocrx_word' id='word_1_76' title='bbox 996 640 1176 676; x_wconf 88'>channels.</span> <span class='ocrx_word' id='word_1_77' title='bbox 1194 640 1498 684; x_wconf 90'>Simultaneously</span> <span class='ocrx_word' id='word_1_78' title='bbox 1510 640 1609 685; x_wconf 90'>plays</span> <span class='ocrx_word' id='word_1_79' title='bbox 1624 651 1674 684; x_wconf 91'>up</span> <span class='ocrx_word' id='word_1_80' title='bbox 1688 645 1727 676; x_wconf 90'>to</span> <span class='ocrx_word' id='word_1_81' title='bbox 1742 641 1780 676; x_wconf 94'>16</span> <span class='ocrx_word' id='word_1_82' title='bbox 1794 640 2022 684; x_wconf 87'>polyphonic</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_4' title="bbox 384 689 632 734">
+    <p class='ocr_par' id='par_1_6' lang='eng' title="bbox 384 689 632 734">
+     <span class='ocr_line' id='line_1_9' title="bbox 384 689 632 734; baseline 0.004 -9; x_size 46; x_descenders 9; x_ascenders 12"><span class='ocrx_word' id='word_1_83' title='bbox 384 689 618 734; x_wconf 84'>synthesizers</span> <span class='ocrx_word' id='word_1_84' title='bbox 625 690 632 726; x_wconf 85'><strong>!</strong></span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_5' title="bbox 349 748 2117 793">
+    <p class='ocr_par' id='par_1_7' lang='eng' title="bbox 349 748 2117 793">
+     <span class='ocr_line' id='line_1_10' title="bbox 349 748 2117 793; baseline 0 -9; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_85' title='bbox 349 755 367 774; x_wconf 66'><strong>0</strong></span> <span class='ocrx_word' id='word_1_86' title='bbox 383 748 573 784; x_wconf 87'>Ultra—fast</span> <span class='ocrx_word' id='word_1_87' title='bbox 588 749 606 784; x_wconf 90'>3</span> <span class='ocrx_word' id='word_1_88' title='bbox 616 749 652 784; x_wconf 86'>1/2</span> <span class='ocrx_word' id='word_1_89' title='bbox 663 749 677 764; x_wconf 87'><em>”</em></span> <span class='ocrx_word' id='word_1_90' title='bbox 694 748 775 784; x_wconf 91'>disk</span> <span class='ocrx_word' id='word_1_91' title='bbox 790 748 887 784; x_wconf 89'>drive</span> <span class='ocrx_word' id='word_1_92' title='bbox 901 754 1012 785; x_wconf 85'>stores</span> <span class='ocrx_word' id='word_1_93' title='bbox 1027 748 1194 793; x_wconf 87'>complex</span> <span class='ocrx_word' id='word_1_94' title='bbox 1208 760 1316 793; x_wconf 87'>songs</span> <span class='ocrx_word' id='word_1_95' title='bbox 1330 748 1368 784; x_wconf 87'>in</span> <span class='ocrx_word' id='word_1_96' title='bbox 1382 748 1535 785; x_wconf 87'>seconds</span> <span class='ocrx_word' id='word_1_97' title='bbox 1550 748 1624 784; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_98' title='bbox 1638 748 1746 784; x_wconf 87'>holds</span> <span class='ocrx_word' id='word_1_99' title='bbox 1761 759 1844 784; x_wconf 85'>over</span> <span class='ocrx_word' id='word_1_100' title='bbox 1859 749 2000 791; x_wconf 88'>110,000</span> <span class='ocrx_word' id='word_1_101' title='bbox 2013 753 2117 784; x_wconf 89'>notes</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_6' title="bbox 383 797 554 842">
+    <p class='ocr_par' id='par_1_8' lang='eng' title="bbox 383 797 554 842">
+     <span class='ocr_line' id='line_1_11' title="bbox 383 797 554 842; baseline 0 -8; x_size 45; x_descenders 8; x_ascenders 12"><span class='ocrx_word' id='word_1_102' title='bbox 383 808 446 842; x_wconf 82'>per</span> <span class='ocrx_word' id='word_1_103' title='bbox 459 797 554 834; x_wconf 86'>disk!</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_7' title="bbox 349 855 2030 1016">
+    <p class='ocr_par' id='par_1_9' lang='eng' title="bbox 349 855 2030 1016">
+     <span class='ocr_line' id='line_1_12' title="bbox 350 855 1638 900; baseline 0.001 -9; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_104' title='bbox 350 863 367 881; x_wconf 71'><strong>0</strong></span> <span class='ocrx_word' id='word_1_105' title='bbox 383 856 464 891; x_wconf 90'>One</span> <span class='ocrx_word' id='word_1_106' title='bbox 478 866 520 891; x_wconf 87'>or</span> <span class='ocrx_word' id='word_1_107' title='bbox 534 855 580 891; x_wconf 88'>all</span> <span class='ocrx_word' id='word_1_108' title='bbox 594 856 712 892; x_wconf 89'>tracks</span> <span class='ocrx_word' id='word_1_109' title='bbox 726 867 811 900; x_wconf 90'>may</span> <span class='ocrx_word' id='word_1_110' title='bbox 823 856 869 892; x_wconf 88'>be</span> <span class='ocrx_word' id='word_1_111' title='bbox 882 856 1212 892; x_wconf 90'>TRANSPOSED</span> <span class='ocrx_word' id='word_1_112' title='bbox 1227 861 1264 892; x_wconf 90'>at</span> <span class='ocrx_word' id='word_1_113' title='bbox 1277 856 1338 892; x_wconf 85'>the</span> <span class='ocrx_word' id='word_1_114' title='bbox 1351 856 1463 892; x_wconf 90'>touch</span> <span class='ocrx_word' id='word_1_115' title='bbox 1477 856 1520 892; x_wconf 89'>of</span> <span class='ocrx_word' id='word_1_116' title='bbox 1531 867 1554 892; x_wconf 90'>a</span> <span class='ocrx_word' id='word_1_117' title='bbox 1568 856 1638 900; x_wconf 89'>key.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_13' title="bbox 350 913 1535 958; baseline 0.001 -9; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_118' title='bbox 350 921 367 939; x_wconf 70'><strong>0</strong></span> <span class='ocrx_word' id='word_1_119' title='bbox 383 913 568 950; x_wconf 84'>Exclusive</span> <span class='ocrx_word' id='word_1_120' title='bbox 581 913 756 950; x_wconf 87'>real—time</span> <span class='ocrx_word' id='word_1_121' title='bbox 769 914 929 950; x_wconf 91'>ERASE</span> <span class='ocrx_word' id='word_1_122' title='bbox 944 914 1114 950; x_wconf 87'>function</span> <span class='ocrx_word' id='word_1_123' title='bbox 1128 914 1251 950; x_wconf 88'>makes</span> <span class='ocrx_word' id='word_1_124' title='bbox 1266 914 1400 958; x_wconf 87'>editing</span> <span class='ocrx_word' id='word_1_125' title='bbox 1414 915 1535 950; x_wconf 91'>FAST.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_14' title="bbox 349 971 2030 1016; baseline 0.001 -10; x_size 44; x_descenders 8; x_ascenders 11"><span class='ocrx_word' id='word_1_126' title='bbox 349 979 367 997; x_wconf 67'><strong>0</strong></span> <span class='ocrx_word' id='word_1_127' title='bbox 382 971 568 1007; x_wconf 83'>Exclusive</span> <span class='ocrx_word' id='word_1_128' title='bbox 582 972 773 1007; x_wconf 87'>REPEAT</span> <span class='ocrx_word' id='word_1_129' title='bbox 787 972 958 1008; x_wconf 86'>function</span> <span class='ocrx_word' id='word_1_130' title='bbox 971 972 1245 1016; x_wconf 89'>automatically</span> <span class='ocrx_word' id='word_1_131' title='bbox 1258 977 1396 1016; x_wconf 90'>repeats</span> <span class='ocrx_word' id='word_1_132' title='bbox 1410 983 1481 1016; x_wconf 88'>any</span> <span class='ocrx_word' id='word_1_133' title='bbox 1493 972 1578 1008; x_wconf 91'>held</span> <span class='ocrx_word' id='word_1_134' title='bbox 1592 977 1694 1008; x_wconf 91'>notes</span> <span class='ocrx_word' id='word_1_135' title='bbox 1709 977 1746 1008; x_wconf 85'>at</span> <span class='ocrx_word' id='word_1_136' title='bbox 1760 982 1783 1008; x_wconf 89'>a</span> <span class='ocrx_word' id='word_1_137' title='bbox 1796 972 2030 1016; x_wconf 87'>pre-selected</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_8' title="bbox 382 1021 689 1065">
+    <p class='ocr_par' id='par_1_10' lang='eng' title="bbox 382 1021 689 1065">
+     <span class='ocr_line' id='line_1_15' title="bbox 382 1021 689 1065; baseline 0.003 -8; x_size 45; x_descenders 8; x_ascenders 12"><span class='ocrx_word' id='word_1_138' title='bbox 382 1021 564 1065; x_wconf 87'>rhythmic</span> <span class='ocrx_word' id='word_1_139' title='bbox 577 1021 689 1058; x_wconf 86'>value.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_9' title="bbox 349 1080 2174 1125">
+    <p class='ocr_par' id='par_1_11' lang='eng' title="bbox 349 1080 2174 1125">
+     <span class='ocr_line' id='line_1_16' title="bbox 349 1080 2174 1125; baseline 0.001 -11; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_140' title='bbox 349 1087 367 1105; x_wconf 73'><strong>0</strong></span> <span class='ocrx_word' id='word_1_141' title='bbox 382 1080 567 1115; x_wconf 87'>TIMING</span> <span class='ocrx_word' id='word_1_142' title='bbox 582 1080 908 1116; x_wconf 90'>CORRECTION</span> <span class='ocrx_word' id='word_1_143' title='bbox 921 1080 1041 1116; x_wconf 90'>works</span> <span class='ocrx_word' id='word_1_144' title='bbox 1056 1080 1186 1124; x_wconf 86'>during</span> <span class='ocrx_word' id='word_1_145' title='bbox 1199 1080 1378 1124; x_wconf 89'>playback</span> <span class='ocrx_word' id='word_1_146' title='bbox 1392 1080 1466 1116; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_147' title='bbox 1480 1085 1644 1124; x_wconf 87'>operates</span> <span class='ocrx_word' id='word_1_148' title='bbox 1658 1080 1814 1116; x_wconf 91'>without</span> <span class='ocrx_word' id='word_1_149' title='bbox 1831 1080 2044 1125; x_wconf 87'>‘chopping’</span> <span class='ocrx_word' id='word_1_150' title='bbox 2061 1085 2174 1116; x_wconf 88'>notes.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_10' title="bbox 349 1137 1287 1182">
+    <p class='ocr_par' id='par_1_12' lang='eng' title="bbox 349 1137 1287 1182">
+     <span class='ocr_line' id='line_1_17' title="bbox 349 1137 1287 1182; baseline 0.001 -9; x_size 45; x_descenders 9; x_ascenders 11"><span class='ocrx_word' id='word_1_151' title='bbox 349 1145 367 1163; x_wconf 73'><strong>0</strong></span> <span class='ocrx_word' id='word_1_152' title='bbox 382 1137 560 1182; x_wconf 85'>Optional</span> <span class='ocrx_word' id='word_1_153' title='bbox 575 1138 739 1174; x_wconf 89'>SMPTE</span> <span class='ocrx_word' id='word_1_154' title='bbox 752 1138 839 1174; x_wconf 89'>time</span> <span class='ocrx_word' id='word_1_155' title='bbox 853 1138 945 1174; x_wconf 89'>code</span> <span class='ocrx_word' id='word_1_156' title='bbox 959 1138 1287 1182; x_wconf 88'>synchronization.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_11' title="bbox 349 1195 874 1240">
+    <p class='ocr_par' id='par_1_13' lang='eng' title="bbox 349 1195 874 1240">
+     <span class='ocr_line' id='line_1_18' title="bbox 349 1195 874 1240; baseline 0 -8; x_size 45; x_descenders 8; x_ascenders 12"><span class='ocrx_word' id='word_1_157' title='bbox 349 1203 367 1222; x_wconf 70'><strong>0</strong></span> <span class='ocrx_word' id='word_1_158' title='bbox 382 1195 560 1240; x_wconf 87'>Optional</span> <span class='ocrx_word' id='word_1_159' title='bbox 573 1201 709 1233; x_wconf 86'>remote</span> <span class='ocrx_word' id='word_1_160' title='bbox 723 1196 874 1233; x_wconf 87'>control.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_12' title="bbox 346 1288 1239 1491">
+    <p class='ocr_par' id='par_1_14' lang='eng' title="bbox 346 1288 749 1329">
+     <span class='ocr_line' id='line_1_19' title="bbox 346 1288 749 1329; baseline 0.002 -9; x_size 42; x_descenders 9; x_ascenders 10"><span class='ocrx_word' id='word_1_161' title='bbox 346 1288 535 1329; x_wconf 82'>Recording</span> <span class='ocrx_word' id='word_1_162' title='bbox 547 1298 567 1321; x_wconf 73'>3</span> <span class='ocrx_word' id='word_1_163' title='bbox 579 1288 749 1328; x_wconf 86'>Sequence</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_15' lang='eng' title="bbox 346 1339 1239 1491">
+     <span class='ocr_line' id='line_1_20' title="bbox 383 1339 1239 1373; baseline 0 -7; x_size 33; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_164' title='bbox 383 1340 420 1366; x_wconf 87'>To</span> <span class='ocrx_word' id='word_1_165' title='bbox 430 1339 524 1366; x_wconf 85'>record</span> <span class='ocrx_word' id='word_1_166' title='bbox 535 1347 551 1366; x_wconf 87'>a</span> <span class='ocrx_word' id='word_1_167' title='bbox 562 1347 704 1373; x_wconf 80'>sequence,</span> <span class='ocrx_word' id='word_1_168' title='bbox 716 1340 815 1373; x_wconf 91'>simply</span> <span class='ocrx_word' id='word_1_169' title='bbox 825 1348 898 1373; x_wconf 88'>press</span> <span class='ocrx_word' id='word_1_170' title='bbox 910 1340 1065 1367; x_wconf 90'>RECORD</span> <span class='ocrx_word' id='word_1_171' title='bbox 1075 1340 1131 1367; x_wconf 87'>and</span> <span class='ocrx_word' id='word_1_172' title='bbox 1142 1341 1239 1372; x_wconf 87'>PLAY,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_21' title="bbox 346 1378 1205 1412; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_173' title='bbox 346 1379 411 1406; x_wconf 91'>then</span> <span class='ocrx_word' id='word_1_174' title='bbox 422 1378 483 1412; x_wconf 89'>play</span> <span class='ocrx_word' id='word_1_175' title='bbox 493 1387 562 1412; x_wconf 87'>your</span> <span class='ocrx_word' id='word_1_176' title='bbox 572 1379 659 1405; x_wconf 89'>MIDI</span> <span class='ocrx_word' id='word_1_177' title='bbox 671 1379 810 1412; x_wconf 86'>keyboard</span> <span class='ocrx_word' id='word_1_178' title='bbox 821 1379 848 1406; x_wconf 90'>in</span> <span class='ocrx_word' id='word_1_179' title='bbox 858 1379 923 1406; x_wconf 90'>time</span> <span class='ocrx_word' id='word_1_180' title='bbox 934 1384 963 1406; x_wconf 90'>to</span> <span class='ocrx_word' id='word_1_181' title='bbox 974 1379 1019 1406; x_wconf 92'>the</span> <span class='ocrx_word' id='word_1_182' title='bbox 1030 1379 1205 1412; x_wconf 88'>Sequencer’s</span> 
+     </span>
+     <span class='ocr_line' id='line_1_22' title="bbox 347 1417 1232 1452; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_183' title='bbox 347 1417 414 1445; x_wconf 86'>click</span> <span class='ocrx_word' id='word_1_184' title='bbox 425 1418 506 1445; x_wconf 84'>track.</span> <span class='ocrx_word' id='word_1_185' title='bbox 519 1418 609 1445; x_wconf 85'>When</span> <span class='ocrx_word' id='word_1_186' title='bbox 620 1419 665 1445; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_187' title='bbox 676 1426 810 1452; x_wconf 86'>sequence</span> <span class='ocrx_word' id='word_1_188' title='bbox 821 1419 901 1452; x_wconf 88'>loops</span> <span class='ocrx_word' id='word_1_189' title='bbox 912 1419 983 1446; x_wconf 86'>back</span> <span class='ocrx_word' id='word_1_190' title='bbox 995 1419 1101 1446; x_wconf 90'>around</span> <span class='ocrx_word' id='word_1_191' title='bbox 1112 1423 1141 1446; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_192' title='bbox 1152 1419 1201 1446; x_wconf 87'>bar</span> <span class='ocrx_word' id='word_1_193' title='bbox 1213 1419 1232 1450; x_wconf 88'>1,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_23' title="bbox 346 1457 1223 1491; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_194' title='bbox 346 1457 430 1490; x_wconf 84'>you’ll</span> <span class='ocrx_word' id='word_1_195' title='bbox 441 1457 506 1485; x_wconf 93'>hear</span> <span class='ocrx_word' id='word_1_196' title='bbox 517 1458 590 1485; x_wconf 79'>what</span> <span class='ocrx_word' id='word_1_197' title='bbox 600 1466 654 1491; x_wconf 88'>you</span> <span class='ocrx_word' id='word_1_198' title='bbox 666 1458 865 1491; x_wconf 77'>played—only</span> <span class='ocrx_word' id='word_1_199' title='bbox 876 1458 910 1485; x_wconf 90'>all</span> <span class='ocrx_word' id='word_1_200' title='bbox 921 1458 1018 1491; x_wconf 84'>timing</span> <span class='ocrx_word' id='word_1_201' title='bbox 1029 1466 1115 1485; x_wconf 84'>errors</span> <span class='ocrx_word' id='word_1_202' title='bbox 1126 1458 1179 1485; x_wconf 91'>will</span> <span class='ocrx_word' id='word_1_203' title='bbox 1189 1458 1223 1485; x_wconf 91'>be</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_13' title="bbox 346 1497 1245 1531">
+    <p class='ocr_par' id='par_1_16' lang='eng' title="bbox 346 1497 1245 1531">
+     <span class='ocr_line' id='line_1_24' title="bbox 346 1497 1245 1531; baseline 0.001 -7; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_204' title='bbox 346 1497 494 1524; x_wconf 86'>corrected!</span> <span class='ocrx_word' id='word_1_205' title='bbox 508 1497 628 1530; x_wconf 85'>(Timing</span> <span class='ocrx_word' id='word_1_206' title='bbox 638 1497 791 1525; x_wconf 82'>correction</span> <span class='ocrx_word' id='word_1_207' title='bbox 802 1506 864 1531; x_wconf 88'>may</span> <span class='ocrx_word' id='word_1_208' title='bbox 875 1498 909 1525; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_209' title='bbox 920 1497 1047 1531; x_wconf 81'>adjusted</span> <span class='ocrx_word' id='word_1_210' title='bbox 1058 1505 1089 1525; x_wconf 92'>or</span> <span class='ocrx_word' id='word_1_211' title='bbox 1099 1497 1245 1531; x_wconf 87'>defeated).</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_14' title="bbox 346 1536 1205 1965">
+    <p class='ocr_par' id='par_1_17' lang='eng' title="bbox 346 1536 1186 1610">
+     <span class='ocr_line' id='line_1_25' title="bbox 346 1536 1186 1570; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_212' title='bbox 346 1537 409 1569; x_wconf 90'>Any</span> <span class='ocrx_word' id='word_1_213' title='bbox 419 1536 571 1563; x_wconf 86'>additional</span> <span class='ocrx_word' id='word_1_214' title='bbox 582 1541 659 1564; x_wconf 85'>notes</span> <span class='ocrx_word' id='word_1_215' title='bbox 670 1537 766 1570; x_wconf 87'>played</span> <span class='ocrx_word' id='word_1_216' title='bbox 777 1537 830 1563; x_wconf 88'>will</span> <span class='ocrx_word' id='word_1_217' title='bbox 840 1537 874 1564; x_wconf 92'>be</span> <span class='ocrx_word' id='word_1_218' title='bbox 885 1537 976 1564; x_wconf 88'>added</span> <span class='ocrx_word' id='word_1_219' title='bbox 986 1537 1045 1564; x_wconf 89'>into</span> <span class='ocrx_word' id='word_1_220' title='bbox 1055 1537 1101 1564; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_221' title='bbox 1111 1537 1186 1564; x_wconf 82'>track</span> 
+     </span>
+     <span class='ocr_line' id='line_1_26' title="bbox 347 1575 1052 1610; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_222' title='bbox 347 1575 495 1609; x_wconf 86'>—existing</span> <span class='ocrx_word' id='word_1_223' title='bbox 505 1580 582 1603; x_wconf 89'>notes</span> <span class='ocrx_word' id='word_1_224' title='bbox 593 1584 637 1603; x_wconf 90'>are</span> <span class='ocrx_word' id='word_1_225' title='bbox 648 1580 696 1603; x_wconf 88'>not</span> <span class='ocrx_word' id='word_1_226' title='bbox 707 1576 800 1603; x_wconf 90'>erased</span> <span class='ocrx_word' id='word_1_227' title='bbox 811 1576 890 1603; x_wconf 87'>while</span> <span class='ocrx_word' id='word_1_228' title='bbox 900 1576 1052 1610; x_wconf 87'>recording!</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_18' lang='eng' title="bbox 346 1616 1205 1965">
+     <span class='ocr_line' id='line_1_27' title="bbox 384 1616 1199 1648; baseline 0.001 -6; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_229' title='bbox 384 1616 471 1642; x_wconf 88'>FAST</span> <span class='ocrx_word' id='word_1_230' title='bbox 481 1616 671 1648; x_wconf 88'>FORWARD,</span> <span class='ocrx_word' id='word_1_231' title='bbox 684 1617 844 1648; x_wconf 87'>REWIND,</span> <span class='ocrx_word' id='word_1_232' title='bbox 857 1616 912 1643; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_233' title='bbox 924 1616 1068 1643; x_wconf 78'>LOCATE</span> <span class='ocrx_word' id='word_1_234' title='bbox 1079 1616 1199 1643; x_wconf 87'>controls</span> 
+     </span>
+     <span class='ocr_line' id='line_1_28' title="bbox 346 1655 1202 1689; baseline 0 -7; x_size 34; x_descenders 6; x_ascenders 9"><span class='ocrx_word' id='word_1_235' title='bbox 346 1663 409 1688; x_wconf 89'>may</span> <span class='ocrx_word' id='word_1_236' title='bbox 419 1655 453 1682; x_wconf 94'>be</span> <span class='ocrx_word' id='word_1_237' title='bbox 463 1655 530 1682; x_wconf 90'>used</span> <span class='ocrx_word' id='word_1_238' title='bbox 541 1659 569 1682; x_wconf 90'>at</span> <span class='ocrx_word' id='word_1_239' title='bbox 580 1663 632 1688; x_wconf 86'>any</span> <span class='ocrx_word' id='word_1_240' title='bbox 642 1655 707 1683; x_wconf 88'>time</span> <span class='ocrx_word' id='word_1_241' title='bbox 717 1659 746 1683; x_wconf 88'>to</span> <span class='ocrx_word' id='word_1_242' title='bbox 757 1655 867 1689; x_wconf 88'>quickly</span> <span class='ocrx_word' id='word_1_243' title='bbox 878 1664 968 1683; x_wconf 87'>access</span> <span class='ocrx_word' id='word_1_244' title='bbox 979 1664 1032 1689; x_wconf 87'>any</span> <span class='ocrx_word' id='word_1_245' title='bbox 1042 1655 1164 1683; x_wconf 90'>location</span> <span class='ocrx_word' id='word_1_246' title='bbox 1174 1655 1202 1682; x_wconf 94'>in</span> 
+     </span>
+     <span class='ocr_line' id='line_1_29' title="bbox 346 1694 1204 1728; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_247' title='bbox 346 1702 414 1727; x_wconf 88'>your</span> <span class='ocrx_word' id='word_1_248' title='bbox 424 1702 558 1727; x_wconf 87'>sequence</span> <span class='ocrx_word' id='word_1_249' title='bbox 570 1694 612 1721; x_wconf 84'>for</span> <span class='ocrx_word' id='word_1_250' title='bbox 623 1695 847 1728; x_wconf 84'>spot—recording.</span> <span class='ocrx_word' id='word_1_251' title='bbox 860 1696 897 1722; x_wconf 89'>To</span> <span class='ocrx_word' id='word_1_252' title='bbox 908 1695 1028 1722; x_wconf 82'>overdub</span> <span class='ocrx_word' id='word_1_253' title='bbox 1039 1703 1056 1722; x_wconf 91'>a</span> <span class='ocrx_word' id='word_1_254' title='bbox 1066 1703 1125 1722; x_wconf 89'>new</span> <span class='ocrx_word' id='word_1_255' title='bbox 1135 1699 1204 1728; x_wconf 88'>part,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_30' title="bbox 347 1733 1150 1768; baseline 0.001 -8; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_256' title='bbox 347 1733 426 1761; x_wconf 88'>select</span> <span class='ocrx_word' id='word_1_257' title='bbox 437 1741 453 1761; x_wconf 88'>a</span> <span class='ocrx_word' id='word_1_258' title='bbox 463 1733 589 1761; x_wconf 86'>different</span> <span class='ocrx_word' id='word_1_259' title='bbox 599 1734 674 1761; x_wconf 85'>track</span> <span class='ocrx_word' id='word_1_260' title='bbox 685 1734 741 1761; x_wconf 87'>and</span> <span class='ocrx_word' id='word_1_261' title='bbox 752 1738 818 1761; x_wconf 83'>start</span> <span class='ocrx_word' id='word_1_262' title='bbox 828 1734 1086 1768; x_wconf 63'>recording~while</span> <span class='ocrx_word' id='word_1_263' title='bbox 1096 1742 1150 1767; x_wconf 89'>you</span> 
+     </span>
+     <span class='ocr_line' id='line_1_31' title="bbox 346 1773 1203 1808; baseline 0.001 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_264' title='bbox 346 1774 448 1806; x_wconf 86'>record,</span> <span class='ocrx_word' id='word_1_265' title='bbox 460 1774 506 1801; x_wconf 87'>the</span> <span class='ocrx_word' id='word_1_266' title='bbox 517 1773 662 1801; x_wconf 64'>first‘track</span> <span class='ocrx_word' id='word_1_267' title='bbox 673 1774 726 1801; x_wconf 91'>will</span> <span class='ocrx_word' id='word_1_268' title='bbox 736 1774 799 1807; x_wconf 89'>play</span> <span class='ocrx_word' id='word_1_269' title='bbox 809 1774 836 1801; x_wconf 91'>in</span> <span class='ocrx_word' id='word_1_270' title='bbox 847 1774 949 1808; x_wconf 84'>perfect</span> <span class='ocrx_word' id='word_1_271' title='bbox 961 1782 1026 1808; x_wconf 87'>sync</span> <span class='ocrx_word' id='word_1_272' title='bbox 1037 1774 1137 1808; x_wconf 89'>(unless</span> <span class='ocrx_word' id='word_1_273' title='bbox 1148 1782 1203 1807; x_wconf 93'>you</span> 
+     </span>
+     <span class='ocr_line' id='line_1_32' title="bbox 346 1813 1191 1847; baseline 0.002 -8; x_size 33; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_274' title='bbox 346 1813 454 1840; x_wconf 86'>MUTE</span> <span class='ocrx_word' id='word_1_275' title='bbox 464 1813 492 1845; x_wconf 88'>it,</span> <span class='ocrx_word' id='word_1_276' title='bbox 505 1821 537 1840; x_wconf 84'>or</span> <span class='ocrx_word' id='word_1_277' title='bbox 547 1813 642 1840; x_wconf 88'>SOLO</span> <span class='ocrx_word' id='word_1_278' title='bbox 653 1814 769 1841; x_wconf 87'>another</span> <span class='ocrx_word' id='word_1_279' title='bbox 779 1814 875 1847; x_wconf 86'>track).</span> <span class='ocrx_word' id='word_1_280' title='bbox 889 1814 920 1840; x_wconf 86'>In</span> <span class='ocrx_word' id='word_1_281' title='bbox 930 1813 984 1841; x_wconf 86'>this</span> <span class='ocrx_word' id='word_1_282' title='bbox 995 1822 1057 1847; x_wconf 87'>way,</span> <span class='ocrx_word' id='word_1_283' title='bbox 1069 1822 1106 1847; x_wconf 88'>up</span> <span class='ocrx_word' id='word_1_284' title='bbox 1117 1818 1146 1841; x_wconf 77'>to</span> <span class='ocrx_word' id='word_1_285' title='bbox 1158 1814 1191 1841; x_wconf 90'>32</span> 
+     </span>
+     <span class='ocr_line' id='line_1_33' title="bbox 346 1852 1205 1885; baseline 0.001 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_286' title='bbox 346 1852 434 1879; x_wconf 84'>tracks</span> <span class='ocrx_word' id='word_1_287' title='bbox 445 1860 508 1885; x_wconf 90'>may</span> <span class='ocrx_word' id='word_1_288' title='bbox 518 1853 552 1879; x_wconf 93'>be</span> <span class='ocrx_word' id='word_1_289' title='bbox 562 1853 748 1880; x_wconf 90'>overdubbed!</span> <span class='ocrx_word' id='word_1_290' title='bbox 761 1853 808 1880; x_wconf 92'>All</span> <span class='ocrx_word' id='word_1_291' title='bbox 819 1854 905 1880; x_wconf 81'>MIDI</span> <span class='ocrx_word' id='word_1_292' title='bbox 917 1853 1011 1880; x_wconf 81'>effects</span> <span class='ocrx_word' id='word_1_293' title='bbox 1022 1861 1067 1880; x_wconf 86'>are</span> <span class='ocrx_word' id='word_1_294' title='bbox 1076 1853 1205 1880; x_wconf 87'>recorded</span> 
+     </span>
+     <span class='ocr_line' id='line_1_34' title="bbox 346 1891 1168 1926; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_295' title='bbox 346 1891 485 1925; x_wconf 84'>including</span> <span class='ocrx_word' id='word_1_296' title='bbox 495 1891 570 1925; x_wconf 87'>pitch</span> <span class='ocrx_word' id='word_1_297' title='bbox 580 1892 663 1924; x_wconf 84'>bend,</span> <span class='ocrx_word' id='word_1_298' title='bbox 675 1892 859 1924; x_wconf 86'>modulation,</span> <span class='ocrx_word' id='word_1_299' title='bbox 872 1892 991 1926; x_wconf 83'>velocity,</span> <span class='ocrx_word' id='word_1_300' title='bbox 1004 1892 1168 1924; x_wconf 85'>aftertouch,</span> 
+     </span>
+     <span class='ocr_line' id='line_1_35' title="bbox 346 1931 895 1965; baseline 0.002 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_301' title='bbox 346 1931 448 1958; x_wconf 88'>sustain</span> <span class='ocrx_word' id='word_1_302' title='bbox 459 1931 549 1965; x_wconf 88'>pedal,</span> <span class='ocrx_word' id='word_1_303' title='bbox 561 1932 617 1959; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_304' title='bbox 628 1940 756 1965; x_wconf 88'>program</span> <span class='ocrx_word' id='word_1_305' title='bbox 766 1932 895 1965; x_wconf 87'>changes!</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_15' title="bbox 346 1998 1212 2163">
+    <p class='ocr_par' id='par_1_19' lang='eng' title="bbox 346 1998 479 2040">
+     <span class='ocr_line' id='line_1_36' title="bbox 346 1998 479 2040; baseline -0.008 -9; x_size 43; x_descenders 10; x_ascenders 11"><span class='ocrx_word' id='word_1_306' title='bbox 346 1998 479 2040; x_wconf 87'>Editing</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_20' lang='eng' title="bbox 346 2050 1212 2163">
+     <span class='ocr_line' id='line_1_37' title="bbox 383 2050 1186 2084; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_307' title='bbox 383 2050 419 2076; x_wconf 89'>To</span> <span class='ocrx_word' id='word_1_308' title='bbox 430 2057 503 2076; x_wconf 87'>erase</span> <span class='ocrx_word' id='word_1_309' title='bbox 514 2058 530 2077; x_wconf 91'>a</span> <span class='ocrx_word' id='word_1_310' title='bbox 540 2058 634 2083; x_wconf 88'>wrong</span> <span class='ocrx_word' id='word_1_311' title='bbox 644 2054 717 2082; x_wconf 84'>note,</span> <span class='ocrx_word' id='word_1_312' title='bbox 729 2050 829 2083; x_wconf 89'>simply</span> <span class='ocrx_word' id='word_1_313' title='bbox 839 2050 905 2077; x_wconf 88'>hold</span> <span class='ocrx_word' id='word_1_314' title='bbox 916 2051 1037 2077; x_wconf 85'>ERASE</span> <span class='ocrx_word' id='word_1_315' title='bbox 1048 2050 1103 2077; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_316' title='bbox 1113 2059 1186 2084; x_wconf 89'>press</span> 
+     </span>
+     <span class='ocr_line' id='line_1_38' title="bbox 346 2089 1212 2124; baseline 0.002 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_317' title='bbox 346 2089 391 2116; x_wconf 86'>the</span> <span class='ocrx_word' id='word_1_318' title='bbox 402 2094 465 2117; x_wconf 86'>note</span> <span class='ocrx_word' id='word_1_319' title='bbox 475 2094 504 2117; x_wconf 86'>to</span> <span class='ocrx_word' id='word_1_320' title='bbox 515 2090 549 2117; x_wconf 93'>be</span> <span class='ocrx_word' id='word_1_321' title='bbox 559 2090 652 2117; x_wconf 89'>erased</span> <span class='ocrx_word' id='word_1_322' title='bbox 661 2090 718 2123; x_wconf 91'>just</span> <span class='ocrx_word' id='word_1_323' title='bbox 729 2090 822 2117; x_wconf 85'>before</span> <span class='ocrx_word' id='word_1_324' title='bbox 833 2090 852 2117; x_wconf 89'>it</span> <span class='ocrx_word' id='word_1_325' title='bbox 862 2090 937 2124; x_wconf 87'>plays</span> <span class='ocrx_word' id='word_1_326' title='bbox 947 2090 975 2117; x_wconf 92'>in</span> <span class='ocrx_word' id='word_1_327' title='bbox 986 2090 1032 2118; x_wconf 87'>the</span> <span class='ocrx_word' id='word_1_328' title='bbox 1043 2098 1212 2124; x_wconf 78'>sequence—</span> 
+     </span>
+     <span class='ocr_line' id='line_1_39' title="bbox 346 2129 1134 2163; baseline 0.003 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_329' title='bbox 346 2129 425 2156; x_wconf 92'>when</span> <span class='ocrx_word' id='word_1_330' title='bbox 435 2129 531 2162; x_wconf 91'>played</span> <span class='ocrx_word' id='word_1_331' title='bbox 542 2129 621 2161; x_wconf 82'>back,</span> <span class='ocrx_word' id='word_1_332' title='bbox 633 2129 652 2156; x_wconf 84'>it</span> <span class='ocrx_word' id='word_1_333' title='bbox 663 2129 716 2156; x_wconf 89'>will</span> <span class='ocrx_word' id='word_1_334' title='bbox 726 2130 760 2157; x_wconf 88'>be</span> <span class='ocrx_word' id='word_1_335' title='bbox 771 2138 849 2163; x_wconf 86'>gone.</span> <span class='ocrx_word' id='word_1_336' title='bbox 861 2131 947 2157; x_wconf 86'>Notes</span> <span class='ocrx_word' id='word_1_337' title='bbox 958 2138 1021 2163; x_wconf 88'>may</span> <span class='ocrx_word' id='word_1_338' title='bbox 1031 2130 1089 2157; x_wconf 87'>also</span> <span class='ocrx_word' id='word_1_339' title='bbox 1100 2130 1134 2157; x_wconf 91'>be</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_16' title="bbox 345 2168 1228 2242">
+    <p class='ocr_par' id='par_1_21' lang='eng' title="bbox 345 2168 1228 2242">
+     <span class='ocr_line' id='line_1_40' title="bbox 346 2168 1220 2203; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_340' title='bbox 346 2168 445 2200; x_wconf 86'>added,</span> <span class='ocrx_word' id='word_1_341' title='bbox 457 2168 560 2200; x_wconf 87'>erased,</span> <span class='ocrx_word' id='word_1_342' title='bbox 572 2177 604 2196; x_wconf 93'>or</span> <span class='ocrx_word' id='word_1_343' title='bbox 614 2169 739 2202; x_wconf 82'>changed</span> <span class='ocrx_word' id='word_1_344' title='bbox 749 2169 829 2203; x_wconf 86'>using</span> <span class='ocrx_word' id='word_1_345' title='bbox 839 2169 885 2196; x_wconf 85'>the</span> <span class='ocrx_word' id='word_1_346' title='bbox 896 2170 1031 2196; x_wconf 89'>SINGLE</span> <span class='ocrx_word' id='word_1_347' title='bbox 1042 2170 1131 2196; x_wconf 87'>STEP</span> <span class='ocrx_word' id='word_1_348' title='bbox 1143 2169 1220 2196; x_wconf 82'>func-</span> 
+     </span>
+     <span class='ocr_line' id='line_1_41' title="bbox 345 2207 1228 2242; baseline 0.002 -8; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_349' title='bbox 345 2207 412 2234; x_wconf 87'>tion.</span> <span class='ocrx_word' id='word_1_350' title='bbox 424 2208 461 2235; x_wconf 88'>To</span> <span class='ocrx_word' id='word_1_351' title='bbox 472 2208 592 2235; x_wconf 88'>overdub</span> <span class='ocrx_word' id='word_1_352' title='bbox 603 2212 680 2235; x_wconf 84'>notes</span> <span class='ocrx_word' id='word_1_353' title='bbox 691 2212 718 2235; x_wconf 89'>at</span> <span class='ocrx_word' id='word_1_354' title='bbox 729 2208 841 2242; x_wconf 83'>specific</span> <span class='ocrx_word' id='word_1_355' title='bbox 851 2209 943 2242; x_wconf 89'>points</span> <span class='ocrx_word' id='word_1_356' title='bbox 955 2208 1049 2236; x_wconf 87'>within</span> <span class='ocrx_word' id='word_1_357' title='bbox 1060 2217 1076 2236; x_wconf 87'>a</span> <span class='ocrx_word' id='word_1_358' title='bbox 1086 2216 1228 2242; x_wconf 86'>sequence,</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_17' title="bbox 345 2293 705 2326">
+    <p class='ocr_par' id='par_1_22' lang='eng' title="bbox 345 2293 705 2326">
+     <span class='ocr_line' id='line_1_42' title="bbox 345 2293 705 2326; baseline 0.003 -1; x_size 38.38298; x_descenders 5.3829789; x_ascenders 10"><span class='ocrx_word' id='word_1_359' title='bbox 345 2293 541 2326; x_wconf 86'>Additional</span> <span class='ocrx_word' id='word_1_360' title='bbox 553 2293 705 2326; x_wconf 83'>Features</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_18' title="bbox 1295 1289 2165 1593">
+    <p class='ocr_par' id='par_1_23' lang='eng' title="bbox 1296 1289 2165 1362">
+     <span class='ocr_line' id='line_1_43' title="bbox 1296 1289 2165 1322; baseline 0.001 -7; x_size 35.040108; x_descenders 6.9264708; x_ascenders 8.613636"><span class='ocrx_word' id='word_1_361' title='bbox 1296 1289 1394 1322; x_wconf 91'>simply</span> <span class='ocrx_word' id='word_1_362' title='bbox 1404 1297 1452 1316; x_wconf 87'>use</span> <span class='ocrx_word' id='word_1_363' title='bbox 1463 1290 1615 1321; x_wconf 86'>LOCATE,</span> <span class='ocrx_word' id='word_1_364' title='bbox 1628 1290 1716 1316; x_wconf 88'>FAST</span> <span class='ocrx_word' id='word_1_365' title='bbox 1726 1289 1917 1321; x_wconf 86'>FORWARD,</span> <span class='ocrx_word' id='word_1_366' title='bbox 1929 1297 1960 1317; x_wconf 92'>or</span> <span class='ocrx_word' id='word_1_367' title='bbox 1972 1290 2126 1316; x_wconf 91'>REWIND</span> <span class='ocrx_word' id='word_1_368' title='bbox 2136 1294 2165 1317; x_wconf 82'>to</span> 
+     </span>
+     <span class='ocr_line' id='line_1_44' title="bbox 1297 1328 2033 1362; baseline 0.001 -7; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_369' title='bbox 1297 1328 1356 1355; x_wconf 77'>find</span> <span class='ocrx_word' id='word_1_370' title='bbox 1366 1329 1412 1355; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_371' title='bbox 1423 1328 1527 1356; x_wconf 85'>desired</span> <span class='ocrx_word' id='word_1_372' title='bbox 1537 1329 1587 1356; x_wconf 88'>bar</span> <span class='ocrx_word' id='word_1_373' title='bbox 1598 1329 1720 1361; x_wconf 86'>number,</span> <span class='ocrx_word' id='word_1_374' title='bbox 1732 1329 1798 1356; x_wconf 78'>then</span> <span class='ocrx_word' id='word_1_375' title='bbox 1809 1333 1874 1356; x_wconf 87'>start</span> <span class='ocrx_word' id='word_1_376' title='bbox 1885 1329 2033 1362; x_wconf 85'>recording.</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_24' lang='eng' title="bbox 1295 1368 2160 1593">
+     <span class='ocr_line' id='line_1_45' title="bbox 1332 1368 2160 1402; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_377' title='bbox 1332 1368 1391 1395; x_wconf 90'>The</span> <span class='ocrx_word' id='word_1_378' title='bbox 1402 1368 1650 1395; x_wconf 86'>INSERT/COPY</span> <span class='ocrx_word' id='word_1_379' title='bbox 1662 1368 1789 1395; x_wconf 81'>function</span> <span class='ocrx_word' id='word_1_380' title='bbox 1800 1368 1893 1395; x_wconf 90'>allows</span> <span class='ocrx_word' id='word_1_381' title='bbox 1904 1376 1958 1402; x_wconf 91'>you</span> <span class='ocrx_word' id='word_1_382' title='bbox 1968 1373 1997 1395; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_383' title='bbox 2008 1377 2087 1396; x_wconf 91'>move</span> <span class='ocrx_word' id='word_1_384' title='bbox 2097 1369 2160 1396; x_wconf 89'>bars</span> 
+     </span>
+     <span class='ocr_line' id='line_1_46' title="bbox 1297 1407 2151 1441; baseline 0.002 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_385' title='bbox 1297 1407 1369 1434; x_wconf 86'>from</span> <span class='ocrx_word' id='word_1_386' title='bbox 1380 1415 1433 1434; x_wconf 88'>one</span> <span class='ocrx_word' id='word_1_387' title='bbox 1443 1407 1565 1435; x_wconf 85'>location</span> <span class='ocrx_word' id='word_1_388' title='bbox 1576 1411 1605 1434; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_389' title='bbox 1616 1407 1796 1435; x_wconf 85'>another—in</span> <span class='ocrx_word' id='word_1_390' title='bbox 1806 1408 1852 1435; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_391' title='bbox 1863 1416 1937 1435; x_wconf 90'>same</span> <span class='ocrx_word' id='word_1_392' title='bbox 1948 1416 2083 1441; x_wconf 88'>sequence</span> <span class='ocrx_word' id='word_1_393' title='bbox 2093 1416 2125 1435; x_wconf 90'>or</span> <span class='ocrx_word' id='word_1_394' title='bbox 2135 1416 2151 1435; x_wconf 88'>a</span> 
+     </span>
+     <span class='ocr_line' id='line_1_47' title="bbox 1296 1447 2160 1481; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_395' title='bbox 1296 1447 1421 1474; x_wconf 81'>different</span> <span class='ocrx_word' id='word_1_396' title='bbox 1431 1455 1491 1474; x_wconf 89'>one.</span> <span class='ocrx_word' id='word_1_397' title='bbox 1504 1448 1555 1474; x_wconf 87'>For</span> <span class='ocrx_word' id='word_1_398' title='bbox 1565 1448 1698 1481; x_wconf 84'>example,</span> <span class='ocrx_word' id='word_1_399' title='bbox 1710 1456 1764 1481; x_wconf 91'>you</span> <span class='ocrx_word' id='word_1_400' title='bbox 1775 1448 1863 1481; x_wconf 84'>might</span> <span class='ocrx_word' id='word_1_401' title='bbox 1873 1448 1955 1475; x_wconf 86'>insert</span> <span class='ocrx_word' id='word_1_402' title='bbox 1966 1456 1983 1475; x_wconf 92'>a</span> <span class='ocrx_word' id='word_1_403' title='bbox 1993 1456 2064 1481; x_wconf 88'>copy</span> <span class='ocrx_word' id='word_1_404' title='bbox 2074 1448 2106 1475; x_wconf 90'>of</span> <span class='ocrx_word' id='word_1_405' title='bbox 2115 1448 2160 1475; x_wconf 90'>the</span> 
+     </span>
+     <span class='ocr_line' id='line_1_48' title="bbox 1297 1486 2087 1521; baseline 0 -7; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_406' title='bbox 1297 1486 1355 1514; x_wconf 82'>first</span> <span class='ocrx_word' id='word_1_407' title='bbox 1366 1495 1439 1514; x_wconf 89'>verse</span> <span class='ocrx_word' id='word_1_408' title='bbox 1449 1487 1571 1514; x_wconf 89'>between</span> <span class='ocrx_word' id='word_1_409' title='bbox 1582 1487 1628 1514; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_410' title='bbox 1638 1487 1740 1514; x_wconf 87'>second</span> <span class='ocrx_word' id='word_1_411' title='bbox 1751 1487 1852 1514; x_wconf 83'>chorus</span> <span class='ocrx_word' id='word_1_412' title='bbox 1863 1487 1919 1514; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_413' title='bbox 1929 1487 1975 1514; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_414' title='bbox 1985 1487 2087 1521; x_wconf 85'>bridge.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_49' title="bbox 1296 1527 2047 1560; baseline 0.003 -8; x_size 32; x_descenders 6; x_ascenders 7"><span class='ocrx_word' id='word_1_415' title='bbox 1296 1527 1441 1553; x_wconf 88'>DELETE</span> <span class='ocrx_word' id='word_1_416' title='bbox 1453 1527 1546 1553; x_wconf 90'>BARS</span> <span class='ocrx_word' id='word_1_417' title='bbox 1557 1531 1681 1559; x_wconf 84'>operates</span> <span class='ocrx_word' id='word_1_418' title='bbox 1691 1527 1737 1553; x_wconf 86'>the</span> <span class='ocrx_word' id='word_1_419' title='bbox 1748 1535 1823 1554; x_wconf 90'>same</span> <span class='ocrx_word' id='word_1_420' title='bbox 1833 1535 1891 1560; x_wconf 93'>way</span> <span class='ocrx_word' id='word_1_421' title='bbox 1901 1531 1930 1554; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_422' title='bbox 1940 1535 2047 1554; x_wconf 90'>remove</span> 
+     </span>
+     <span class='ocr_line' id='line_1_50' title="bbox 1295 1565 1577 1593; baseline 0.004 -1; x_size 34.748871; x_descenders 6.7488689; x_ascenders 9"><span class='ocrx_word' id='word_1_423' title='bbox 1295 1565 1441 1592; x_wconf 88'>unwanted</span> <span class='ocrx_word' id='word_1_424' title='bbox 1452 1565 1577 1593; x_wconf 84'>sections.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_19' title="bbox 1295 1638 2215 1960">
+    <p class='ocr_par' id='par_1_25' lang='eng' title="bbox 1296 1638 1589 1680">
+     <span class='ocr_line' id='line_1_51' title="bbox 1296 1638 1589 1680; baseline 0 -9; x_size 42; x_descenders 9; x_ascenders 10"><span class='ocrx_word' id='word_1_425' title='bbox 1296 1638 1452 1680; x_wconf 86'>Creating</span> <span class='ocrx_word' id='word_1_426' title='bbox 1465 1648 1485 1671; x_wconf 85'>a</span> <span class='ocrx_word' id='word_1_427' title='bbox 1497 1639 1589 1680; x_wconf 87'>Song</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_26' lang='eng' title="bbox 1295 1690 2215 1960">
+     <span class='ocr_line' id='line_1_52' title="bbox 1333 1690 2146 1723; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_428' title='bbox 1333 1690 1394 1717; x_wconf 88'>One</span> <span class='ocrx_word' id='word_1_429' title='bbox 1404 1698 1462 1723; x_wconf 93'>way</span> <span class='ocrx_word' id='word_1_430' title='bbox 1472 1694 1500 1717; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_431' title='bbox 1511 1694 1598 1717; x_wconf 88'>create</span> <span class='ocrx_word' id='word_1_432' title='bbox 1608 1698 1625 1717; x_wconf 88'>a</span> <span class='ocrx_word' id='word_1_433' title='bbox 1635 1698 1704 1723; x_wconf 83'>song</span> <span class='ocrx_word' id='word_1_434' title='bbox 1715 1690 1736 1717; x_wconf 90'>is</span> <span class='ocrx_word' id='word_1_435' title='bbox 1747 1694 1776 1717; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_436' title='bbox 1787 1690 1880 1717; x_wconf 86'>record</span> <span class='ocrx_word' id='word_1_437' title='bbox 1891 1690 1958 1717; x_wconf 89'>each</span> <span class='ocrx_word' id='word_1_438' title='bbox 1969 1690 2044 1717; x_wconf 87'>track</span> <span class='ocrx_word' id='word_1_439' title='bbox 2056 1690 2090 1717; x_wconf 89'>all</span> <span class='ocrx_word' id='word_1_440' title='bbox 2101 1690 2146 1717; x_wconf 88'>the</span> 
+     </span>
+     <span class='ocr_line' id='line_1_53' title="bbox 1295 1729 2121 1762; baseline 0.001 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_441' title='bbox 1295 1737 1353 1762; x_wconf 87'>way</span> <span class='ocrx_word' id='word_1_442' title='bbox 1362 1729 1481 1762; x_wconf 83'>through</span> <span class='ocrx_word' id='word_1_443' title='bbox 1493 1729 1541 1762; x_wconf 90'>(up</span> <span class='ocrx_word' id='word_1_444' title='bbox 1552 1733 1581 1756; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_445' title='bbox 1592 1730 1644 1756; x_wconf 89'>999</span> <span class='ocrx_word' id='word_1_446' title='bbox 1654 1729 1738 1762; x_wconf 90'>bars).</span> <span class='ocrx_word' id='word_1_447' title='bbox 1751 1729 1878 1757; x_wconf 89'>Another</span> <span class='ocrx_word' id='word_1_448' title='bbox 1888 1737 1945 1762; x_wconf 89'>way</span> <span class='ocrx_word' id='word_1_449' title='bbox 1956 1729 1977 1757; x_wconf 90'>is</span> <span class='ocrx_word' id='word_1_450' title='bbox 1987 1733 2016 1757; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_451' title='bbox 2027 1729 2121 1757; x_wconf 86'>record</span> 
+     </span>
+     <span class='ocr_line' id='line_1_54' title="bbox 1296 1768 2066 1802; baseline 0 -6; x_size 33; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_452' title='bbox 1296 1768 1362 1796; x_wconf 86'>each</span> <span class='ocrx_word' id='word_1_453' title='bbox 1373 1768 1448 1796; x_wconf 87'>basic</span> <span class='ocrx_word' id='word_1_454' title='bbox 1458 1768 1562 1796; x_wconf 83'>section</span> <span class='ocrx_word' id='word_1_455' title='bbox 1574 1769 1666 1802; x_wconf 89'>(verse,</span> <span class='ocrx_word' id='word_1_456' title='bbox 1679 1769 1788 1801; x_wconf 86'>chorus,</span> <span class='ocrx_word' id='word_1_457' title='bbox 1800 1769 1865 1802; x_wconf 83'>etc.)</span> <span class='ocrx_word' id='word_1_458' title='bbox 1876 1768 1904 1795; x_wconf 91'>in</span> <span class='ocrx_word' id='word_1_459' title='bbox 1914 1768 2066 1796; x_wconf 86'>individual</span> 
+     </span>
+     <span class='ocr_line' id='line_1_55' title="bbox 1296 1808 2215 1841; baseline 0 -6; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_460' title='bbox 1296 1816 1451 1841; x_wconf 85'>sequences,</span> <span class='ocrx_word' id='word_1_461' title='bbox 1463 1808 1528 1835; x_wconf 86'>then</span> <span class='ocrx_word' id='word_1_462' title='bbox 1538 1816 1587 1835; x_wconf 90'>use</span> <span class='ocrx_word' id='word_1_463' title='bbox 1597 1808 1643 1835; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_464' title='bbox 1653 1809 1799 1835; x_wconf 89'>CREATE</span> <span class='ocrx_word' id='word_1_465' title='bbox 1810 1808 1911 1835; x_wconf 89'>SONG</span> <span class='ocrx_word' id='word_1_466' title='bbox 1923 1808 2050 1836; x_wconf 85'>function</span> <span class='ocrx_word' id='word_1_467' title='bbox 2060 1812 2089 1835; x_wconf 89'>to</span> <span class='ocrx_word' id='word_1_468' title='bbox 2103 1808 2215 1836; x_wconf 87'>“chain”</span> 
+     </span>
+     <span class='ocr_line' id='line_1_56' title="bbox 1295 1847 2135 1881; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_469' title='bbox 1295 1848 1370 1874; x_wconf 91'>them</span> <span class='ocrx_word' id='word_1_470' title='bbox 1381 1848 1508 1881; x_wconf 83'>together.</span> <span class='ocrx_word' id='word_1_471' title='bbox 1521 1848 1667 1875; x_wconf 87'>CREATE</span> <span class='ocrx_word' id='word_1_472' title='bbox 1678 1848 1779 1875; x_wconf 91'>SONG</span> <span class='ocrx_word' id='word_1_473' title='bbox 1789 1847 1842 1874; x_wconf 92'>will</span> <span class='ocrx_word' id='word_1_474' title='bbox 1853 1848 1918 1875; x_wconf 86'>then</span> <span class='ocrx_word' id='word_1_475' title='bbox 1929 1848 2135 1881; x_wconf 81'>automatically</span> 
+     </span>
+     <span class='ocr_line' id='line_1_57' title="bbox 1296 1887 2162 1920; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_476' title='bbox 1296 1895 1366 1920; x_wconf 89'>copy</span> <span class='ocrx_word' id='word_1_477' title='bbox 1377 1887 1412 1914; x_wconf 88'>all</span> <span class='ocrx_word' id='word_1_478' title='bbox 1422 1887 1468 1914; x_wconf 85'>the</span> <span class='ocrx_word' id='word_1_479' title='bbox 1478 1891 1552 1920; x_wconf 86'>parts</span> <span class='ocrx_word' id='word_1_480' title='bbox 1563 1887 1621 1914; x_wconf 86'>into</span> <span class='ocrx_word' id='word_1_481' title='bbox 1632 1895 1649 1914; x_wconf 91'>a</span> <span class='ocrx_word' id='word_1_482' title='bbox 1659 1895 1718 1914; x_wconf 91'>new</span> <span class='ocrx_word' id='word_1_483' title='bbox 1729 1895 1870 1920; x_wconf 83'>sequence.</span> <span class='ocrx_word' id='word_1_484' title='bbox 1884 1887 1911 1914; x_wconf 84'>If</span> <span class='ocrx_word' id='word_1_485' title='bbox 1919 1887 2033 1919; x_wconf 89'>desired,</span> <span class='ocrx_word' id='word_1_486' title='bbox 2045 1895 2099 1920; x_wconf 92'>you</span> <span class='ocrx_word' id='word_1_487' title='bbox 2110 1895 2162 1914; x_wconf 85'>can</span> 
+     </span>
+     <span class='ocr_line' id='line_1_58' title="bbox 1296 1926 2169 1960; baseline 0.001 -7; x_size 34; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_488' title='bbox 1296 1934 1361 1953; x_wconf 89'>even</span> <span class='ocrx_word' id='word_1_489' title='bbox 1372 1930 1411 1953; x_wconf 90'>set</span> <span class='ocrx_word' id='word_1_490' title='bbox 1422 1926 1468 1953; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_491' title='bbox 1478 1926 1528 1953; x_wconf 89'>last</span> <span class='ocrx_word' id='word_1_492' title='bbox 1540 1926 1590 1953; x_wconf 88'>few</span> <span class='ocrx_word' id='word_1_493' title='bbox 1601 1927 1664 1953; x_wconf 89'>bars</span> <span class='ocrx_word' id='word_1_494' title='bbox 1675 1931 1704 1954; x_wconf 85'>to</span> <span class='ocrx_word' id='word_1_495' title='bbox 1715 1931 1806 1960; x_wconf 89'>repeat</span> <span class='ocrx_word' id='word_1_496' title='bbox 1816 1926 1955 1960; x_wconf 84'>infinitely,</span> <span class='ocrx_word' id='word_1_497' title='bbox 1968 1926 2011 1954; x_wconf 86'>for</span> <span class='ocrx_word' id='word_1_498' title='bbox 2022 1935 2038 1954; x_wconf 92'>a</span> <span class='ocrx_word' id='word_1_499' title='bbox 2049 1927 2169 1954; x_wconf 83'>fadeout.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_20' title="bbox 1293 2000 2179 2242">
+    <p class='ocr_par' id='par_1_27' lang='eng' title="bbox 1294 2000 1948 2040">
+     <span class='ocr_line' id='line_1_59' title="bbox 1294 2000 1948 2040; baseline 0.002 -8; x_size 40; x_descenders 8; x_ascenders 10"><span class='ocrx_word' id='word_1_500' title='bbox 1294 2000 1532 2040; x_wconf 84'>Composition</span> <span class='ocrx_word' id='word_1_501' title='bbox 1544 2000 1699 2033; x_wconf 85'>Without</span> <span class='ocrx_word' id='word_1_502' title='bbox 1711 2000 1948 2040; x_wconf 85'>Compromise</span> 
+     </span>
+    </p>
+
+    <p class='ocr_par' id='par_1_28' lang='eng' title="bbox 1293 2051 2179 2242">
+     <span class='ocr_line' id='line_1_60' title="bbox 1331 2051 2179 2085; baseline 0 -7; x_size 34; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_503' title='bbox 1331 2051 1389 2078; x_wconf 90'>The</span> <span class='ocrx_word' id='word_1_504' title='bbox 1399 2051 1563 2085; x_wconf 83'>technology</span> <span class='ocrx_word' id='word_1_505' title='bbox 1573 2059 1627 2084; x_wconf 92'>you</span> <span class='ocrx_word' id='word_1_506' title='bbox 1638 2060 1686 2079; x_wconf 86'>use</span> <span class='ocrx_word' id='word_1_507' title='bbox 1697 2051 1797 2078; x_wconf 89'>should</span> <span class='ocrx_word' id='word_1_508' title='bbox 1808 2059 1887 2078; x_wconf 87'>never</span> <span class='ocrx_word' id='word_1_509' title='bbox 1897 2052 1932 2079; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_510' title='bbox 1942 2059 1973 2079; x_wconf 89'>so</span> <span class='ocrx_word' id='word_1_511' title='bbox 1984 2051 2110 2085; x_wconf 85'>complex</span> <span class='ocrx_word' id='word_1_512' title='bbox 2120 2052 2179 2078; x_wconf 86'>that</span> 
+     </span>
+     <span class='ocr_line' id='line_1_61' title="bbox 1294 2090 2157 2124; baseline 0 -6; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_513' title='bbox 1294 2090 1313 2118; x_wconf 86'>it</span> <span class='ocrx_word' id='word_1_514' title='bbox 1323 2091 1459 2118; x_wconf 87'>interferes</span> <span class='ocrx_word' id='word_1_515' title='bbox 1470 2091 1535 2118; x_wconf 84'>with</span> <span class='ocrx_word' id='word_1_516' title='bbox 1545 2091 1591 2118; x_wconf 88'>the</span> <span class='ocrx_word' id='word_1_517' title='bbox 1602 2091 1715 2118; x_wconf 90'>creative</span> <span class='ocrx_word' id='word_1_518' title='bbox 1725 2099 1841 2124; x_wconf 83'>process.</span> <span class='ocrx_word' id='word_1_519' title='bbox 1854 2091 1947 2118; x_wconf 78'>That’s</span> <span class='ocrx_word' id='word_1_520' title='bbox 1957 2091 2086 2124; x_wconf 86'>precisely</span> <span class='ocrx_word' id='word_1_521' title='bbox 2096 2091 2157 2124; x_wconf 89'>why</span> 
+     </span>
+     <span class='ocr_line' id='line_1_62' title="bbox 1293 2130 2156 2164; baseline 0 -7; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_522' title='bbox 1293 2130 1339 2157; x_wconf 90'>the</span> <span class='ocrx_word' id='word_1_523' title='bbox 1350 2130 1576 2164; x_wconf 80'>LinnSequencer</span> <span class='ocrx_word' id='word_1_524' title='bbox 1586 2130 1607 2157; x_wconf 89'>is</span> <span class='ocrx_word' id='word_1_525' title='bbox 1619 2130 1747 2164; x_wconf 87'>designed</span> <span class='ocrx_word' id='word_1_526' title='bbox 1758 2134 1787 2157; x_wconf 87'>to</span> <span class='ocrx_word' id='word_1_527' title='bbox 1798 2130 1834 2157; x_wconf 89'>let</span> <span class='ocrx_word' id='word_1_528' title='bbox 1844 2138 1899 2163; x_wconf 93'>you</span> <span class='ocrx_word' id='word_1_529' title='bbox 1910 2138 2051 2164; x_wconf 88'>compose,</span> <span class='ocrx_word' id='word_1_530' title='bbox 2063 2130 2156 2157; x_wconf 87'>record</span> 
+     </span>
+     <span class='ocr_line' id='line_1_63' title="bbox 1294 2169 2145 2203; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_531' title='bbox 1294 2170 1349 2197; x_wconf 90'>and</span> <span class='ocrx_word' id='word_1_532' title='bbox 1360 2169 1414 2197; x_wconf 83'>edit</span> <span class='ocrx_word' id='word_1_533' title='bbox 1425 2170 1503 2197; x_wconf 89'>while</span> <span class='ocrx_word' id='word_1_534' title='bbox 1514 2170 1643 2203; x_wconf 90'>devoting</span> <span class='ocrx_word' id='word_1_535' title='bbox 1653 2178 1721 2203; x_wconf 92'>your</span> <span class='ocrx_word' id='word_1_536' title='bbox 1731 2170 1882 2197; x_wconf 88'>undivided</span> <span class='ocrx_word' id='word_1_537' title='bbox 1893 2170 2027 2197; x_wconf 86'>attention</span> <span class='ocrx_word' id='word_1_538' title='bbox 2037 2174 2067 2197; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_539' title='bbox 2077 2178 2145 2203; x_wconf 90'>your</span> 
+     </span>
+     <span class='ocr_line' id='line_1_64' title="bbox 1294 2209 2126 2242; baseline 0 -6; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_540' title='bbox 1294 2209 1388 2236; x_wconf 88'>music.</span> <span class='ocrx_word' id='word_1_541' title='bbox 1402 2209 1451 2236; x_wconf 89'>See</span> <span class='ocrx_word' id='word_1_542' title='bbox 1460 2217 1529 2242; x_wconf 92'>your</span> <span class='ocrx_word' id='word_1_543' title='bbox 1540 2209 1611 2236; x_wconf 87'>Linn</span> <span class='ocrx_word' id='word_1_544' title='bbox 1621 2209 1712 2236; x_wconf 86'>dealer</span> <span class='ocrx_word' id='word_1_545' title='bbox 1722 2209 1806 2242; x_wconf 85'>today</span> <span class='ocrx_word' id='word_1_546' title='bbox 1817 2209 1859 2236; x_wconf 87'>for</span> <span class='ocrx_word' id='word_1_547' title='bbox 1870 2217 1887 2236; x_wconf 88'>a</span> <span class='ocrx_word' id='word_1_548' title='bbox 1897 2209 2126 2236; x_wconf 76'>demonstration!</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_21' title="bbox 347 2343 2171 2378">
+    <p class='ocr_par' id='par_1_29' lang='eng' title="bbox 347 2343 2171 2378">
+     <span class='ocr_line' id='line_1_65' title="bbox 347 2343 2171 2378; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_549' title='bbox 347 2350 361 2363; x_wconf 69'><strong>0</strong></span> <span class='ocrx_word' id='word_1_550' title='bbox 373 2343 483 2377; x_wconf 83'>Simple,</span> <span class='ocrx_word' id='word_1_551' title='bbox 495 2352 559 2377; x_wconf 89'>easy</span> <span class='ocrx_word' id='word_1_552' title='bbox 569 2348 598 2371; x_wconf 91'>to</span> <span class='ocrx_word' id='word_1_553' title='bbox 609 2344 683 2371; x_wconf 89'>learn</span> <span class='ocrx_word' id='word_1_554' title='bbox 694 2344 922 2378; x_wconf 80'>operation—the</span> <span class='ocrx_word' id='word_1_555' title='bbox 934 2345 967 2372; x_wconf 88'>32</span> <span class='ocrx_word' id='word_1_556' title='bbox 978 2345 1116 2372; x_wconf 86'>character</span> <span class='ocrx_word' id='word_1_557' title='bbox 1126 2345 1200 2372; x_wconf 92'>LCD</span> <span class='ocrx_word' id='word_1_558' title='bbox 1211 2345 1316 2378; x_wconf 90'>display</span> <span class='ocrx_word' id='word_1_559' title='bbox 1326 2345 1424 2378; x_wconf 88'>clearly</span> <span class='ocrx_word' id='word_1_560' title='bbox 1434 2345 1528 2378; x_wconf 86'>guides</span> <span class='ocrx_word' id='word_1_561' title='bbox 1539 2353 1594 2378; x_wconf 91'>you</span> <span class='ocrx_word' id='word_1_562' title='bbox 1604 2345 1724 2378; x_wconf 87'>through</span> <span class='ocrx_word' id='word_1_563' title='bbox 1735 2344 1770 2371; x_wconf 88'>all</span> <span class='ocrx_word' id='word_1_564' title='bbox 1781 2344 1947 2377; x_wconf 86'>operations.</span> <span class='ocrx_word' id='word_1_565' title='bbox 1961 2344 1989 2371; x_wconf 88'>If</span> <span class='ocrx_word' id='word_1_566' title='bbox 1997 2344 2112 2376; x_wconf 88'>needed,</span> <span class='ocrx_word' id='word_1_567' title='bbox 2125 2345 2171 2371; x_wconf 88'>the</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_22' title="bbox 373 2381 1083 2415">
+    <p class='ocr_par' id='par_1_30' lang='eng' title="bbox 373 2381 1083 2415">
+     <span class='ocr_line' id='line_1_66' title="bbox 373 2381 1083 2415; baseline 0.003 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_568' title='bbox 373 2381 472 2407; x_wconf 85'>HELP</span> <span class='ocrx_word' id='word_1_569' title='bbox 483 2381 583 2408; x_wconf 85'>button</span> <span class='ocrx_word' id='word_1_570' title='bbox 594 2381 711 2415; x_wconf 87'>displays</span> <span class='ocrx_word' id='word_1_571' title='bbox 722 2382 875 2409; x_wconf 89'>additional</span> <span class='ocrx_word' id='word_1_572' title='bbox 886 2382 1083 2415; x_wconf 87'>explanations.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_23' title="bbox 347 2427 2145 2507">
+    <p class='ocr_par' id='par_1_31' lang='eng' title="bbox 347 2427 2145 2507">
+     <span class='ocr_line' id='line_1_67' title="bbox 347 2427 1468 2461; baseline 0.002 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_573' title='bbox 347 2432 361 2446; x_wconf 69'><strong>0</strong></span> <span class='ocrx_word' id='word_1_574' title='bbox 373 2427 612 2454; x_wconf 88'>Non-destructive</span> <span class='ocrx_word' id='word_1_575' title='bbox 622 2427 914 2461; x_wconf 85'>recording—existing</span> <span class='ocrx_word' id='word_1_576' title='bbox 924 2432 1002 2455; x_wconf 90'>notes</span> <span class='ocrx_word' id='word_1_577' title='bbox 1013 2436 1057 2455; x_wconf 88'>are</span> <span class='ocrx_word' id='word_1_578' title='bbox 1068 2432 1116 2455; x_wconf 84'>not</span> <span class='ocrx_word' id='word_1_579' title='bbox 1127 2428 1220 2455; x_wconf 87'>erased</span> <span class='ocrx_word' id='word_1_580' title='bbox 1231 2428 1309 2455; x_wconf 91'>while</span> <span class='ocrx_word' id='word_1_581' title='bbox 1319 2428 1468 2461; x_wconf 87'>recording.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_68' title="bbox 347 2473 2145 2507; baseline 0.001 -8; x_size 35; x_descenders 7; x_ascenders 9"><span class='ocrx_word' id='word_1_582' title='bbox 347 2478 361 2492; x_wconf 71'><strong>0</strong></span> <span class='ocrx_word' id='word_1_583' title='bbox 372 2473 433 2500; x_wconf 90'>Two</span> <span class='ocrx_word' id='word_1_584' title='bbox 444 2473 689 2500; x_wconf 89'>FOOTSWITCH</span> <span class='ocrx_word' id='word_1_585' title='bbox 701 2474 837 2501; x_wconf 79'>INPUTS</span> <span class='ocrx_word' id='word_1_586' title='bbox 848 2481 910 2507; x_wconf 89'>may</span> <span class='ocrx_word' id='word_1_587' title='bbox 921 2473 955 2500; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_588' title='bbox 966 2473 1091 2507; x_wconf 85'>assigned</span> <span class='ocrx_word' id='word_1_589' title='bbox 1101 2478 1130 2501; x_wconf 81'>to</span> <span class='ocrx_word' id='word_1_590' title='bbox 1141 2474 1271 2507; x_wconf 84'>remotely</span> <span class='ocrx_word' id='word_1_591' title='bbox 1281 2473 1387 2501; x_wconf 86'>control</span> <span class='ocrx_word' id='word_1_592' title='bbox 1398 2482 1481 2507; x_wconf 86'>many</span> <span class='ocrx_word' id='word_1_593' title='bbox 1491 2473 1523 2501; x_wconf 90'>of</span> <span class='ocrx_word' id='word_1_594' title='bbox 1531 2474 1578 2501; x_wconf 89'>the</span> <span class='ocrx_word' id='word_1_595' title='bbox 1588 2473 1750 2506; x_wconf 82'>commonly</span> <span class='ocrx_word' id='word_1_596' title='bbox 1760 2473 1827 2500; x_wconf 88'>used</span> <span class='ocrx_word' id='word_1_597' title='bbox 1840 2473 1991 2505; x_wconf 77'>functions,</span> <span class='ocrx_word' id='word_1_598' title='bbox 2003 2473 2145 2507; x_wconf 84'>including</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_24' title="bbox 372 2510 1090 2543">
+    <p class='ocr_par' id='par_1_32' lang='eng' title="bbox 372 2510 1090 2543">
+     <span class='ocr_line' id='line_1_69' title="bbox 372 2510 1090 2543; baseline 0.001 -6; x_size 35.625; x_descenders 8.90625; x_ascenders 8.90625"><span class='ocrx_word' id='word_1_599' title='bbox 372 2510 500 2542; x_wconf 88'>ERASE,</span> <span class='ocrx_word' id='word_1_600' title='bbox 513 2511 660 2542; x_wconf 86'>REPEAT,</span> <span class='ocrx_word' id='word_1_601' title='bbox 673 2511 883 2543; x_wconf 80'>PLAY/STOP,</span> <span class='ocrx_word' id='word_1_602' title='bbox 896 2519 927 2538; x_wconf 90'>or</span> <span class='ocrx_word' id='word_1_603' title='bbox 939 2511 1090 2538; x_wconf 83'>LOCATE.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_25' title="bbox 347 2556 1768 2590">
+    <p class='ocr_par' id='par_1_33' lang='eng' title="bbox 347 2556 1768 2590">
+     <span class='ocr_line' id='line_1_70' title="bbox 347 2556 1768 2590; baseline 0.001 -8; x_size 34; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_604' title='bbox 347 2561 361 2575; x_wconf 71'><strong>0</strong></span> <span class='ocrx_word' id='word_1_605' title='bbox 372 2556 433 2583; x_wconf 91'>Two</span> <span class='ocrx_word' id='word_1_606' title='bbox 443 2556 612 2583; x_wconf 83'>TRIGGER</span> <span class='ocrx_word' id='word_1_607' title='bbox 623 2556 797 2584; x_wconf 84'>OUTPUTS</span> <span class='ocrx_word' id='word_1_608' title='bbox 808 2565 871 2590; x_wconf 89'>may</span> <span class='ocrx_word' id='word_1_609' title='bbox 881 2557 915 2584; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_610' title='bbox 925 2557 1119 2590; x_wconf 84'>programmed</span> <span class='ocrx_word' id='word_1_611' title='bbox 1129 2561 1158 2584; x_wconf 93'>to</span> <span class='ocrx_word' id='word_1_612' title='bbox 1169 2561 1270 2590; x_wconf 87'>output</span> <span class='ocrx_word' id='word_1_613' title='bbox 1281 2557 1370 2590; x_wconf 88'>pulses</span> <span class='ocrx_word' id='word_1_614' title='bbox 1381 2561 1409 2584; x_wconf 92'>at</span> <span class='ocrx_word' id='word_1_615' title='bbox 1419 2565 1472 2590; x_wconf 90'>any</span> <span class='ocrx_word' id='word_1_616' title='bbox 1483 2557 1598 2584; x_wconf 86'>selected</span> <span class='ocrx_word' id='word_1_617' title='bbox 1608 2561 1673 2584; x_wconf 89'>note</span> <span class='ocrx_word' id='word_1_618' title='bbox 1683 2556 1768 2583; x_wconf 89'>value.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_26' title="bbox 347 2601 1226 2635">
+    <p class='ocr_par' id='par_1_34' lang='eng' title="bbox 347 2601 1226 2635">
+     <span class='ocr_line' id='line_1_71' title="bbox 347 2601 1226 2635; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_619' title='bbox 347 2607 361 2620; x_wconf 65'><strong>0</strong></span> <span class='ocrx_word' id='word_1_620' title='bbox 372 2601 434 2628; x_wconf 88'>Will</span> <span class='ocrx_word' id='word_1_621' title='bbox 445 2609 510 2634; x_wconf 89'>sync</span> <span class='ocrx_word' id='word_1_622' title='bbox 521 2605 549 2628; x_wconf 84'>to</span> <span class='ocrx_word' id='word_1_623' title='bbox 561 2602 690 2629; x_wconf 88'>standard</span> <span class='ocrx_word' id='word_1_624' title='bbox 701 2602 864 2629; x_wconf 86'>LinnDrum</span> <span class='ocrx_word' id='word_1_625' title='bbox 875 2610 907 2629; x_wconf 91'>or</span> <span class='ocrx_word' id='word_1_626' title='bbox 918 2602 989 2629; x_wconf 89'>Linn</span> <span class='ocrx_word' id='word_1_627' title='bbox 1000 2603 1069 2629; x_wconf 90'>9000</span> <span class='ocrx_word' id='word_1_628' title='bbox 1080 2610 1145 2635; x_wconf 87'>sync</span> <span class='ocrx_word' id='word_1_629' title='bbox 1155 2607 1226 2630; x_wconf 89'>tone.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_27' title="bbox 347 2648 2100 2727">
+    <p class='ocr_par' id='par_1_35' lang='eng' title="bbox 347 2648 2100 2727">
+     <span class='ocr_line' id='line_1_72' title="bbox 347 2648 1664 2682; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_630' title='bbox 347 2654 360 2667; x_wconf 75'>&#39;</span> <span class='ocrx_word' id='word_1_631' title='bbox 372 2648 483 2675; x_wconf 89'>Utilizes</span> <span class='ocrx_word' id='word_1_632' title='bbox 493 2648 564 2680; x_wconf 75'>ultra</span> <span class='ocrx_word' id='word_1_633' title='bbox 573 2648 744 2682; x_wconf 86'>high—speed,</span> <span class='ocrx_word' id='word_1_634' title='bbox 757 2649 772 2676; x_wconf 91'>8</span> <span class='ocrx_word' id='word_1_635' title='bbox 783 2649 862 2675; x_wconf 89'>MHz</span> <span class='ocrx_word' id='word_1_636' title='bbox 873 2649 954 2676; x_wconf 88'>80186</span> <span class='ocrx_word' id='word_1_637' title='bbox 965 2649 994 2676; x_wconf 91'>16</span> <span class='ocrx_word' id='word_1_638' title='bbox 1004 2648 1043 2676; x_wconf 90'>bit</span> <span class='ocrx_word' id='word_1_639' title='bbox 1054 2653 1197 2682; x_wconf 88'>computer</span> <span class='ocrx_word' id='word_1_640' title='bbox 1208 2649 1350 2682; x_wconf 90'>internally</span> <span class='ocrx_word' id='word_1_641' title='bbox 1361 2649 1403 2676; x_wconf 87'>for</span> <span class='ocrx_word' id='word_1_642' title='bbox 1414 2649 1502 2676; x_wconf 87'>FAST</span> <span class='ocrx_word' id='word_1_643' title='bbox 1512 2648 1664 2682; x_wconf 81'>operation.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_73' title="bbox 347 2694 2100 2727; baseline 0.001 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_644' title='bbox 347 2699 361 2713; x_wconf 70'><strong>0</strong></span> <span class='ocrx_word' id='word_1_645' title='bbox 372 2694 504 2721; x_wconf 88'>TEMPO</span> <span class='ocrx_word' id='word_1_646' title='bbox 515 2702 578 2727; x_wconf 92'>may</span> <span class='ocrx_word' id='word_1_647' title='bbox 589 2694 623 2721; x_wconf 90'>be</span> <span class='ocrx_word' id='word_1_648' title='bbox 633 2694 764 2727; x_wconf 87'>specified</span> <span class='ocrx_word' id='word_1_649' title='bbox 774 2694 802 2721; x_wconf 89'>in</span> <span class='ocrx_word' id='word_1_650' title='bbox 814 2695 1172 2722; x_wconf 84'>BEATS-PER—MINUTE</span> <span class='ocrx_word' id='word_1_651' title='bbox 1183 2703 1215 2722; x_wconf 93'>or</span> <span class='ocrx_word' id='word_1_652' title='bbox 1225 2695 1567 2722; x_wconf 84'>FRAMES-PER—BEAT</span> <span class='ocrx_word' id='word_1_653' title='bbox 1577 2698 1605 2721; x_wconf 89'>at</span> <span class='ocrx_word' id='word_1_654' title='bbox 1616 2695 1659 2726; x_wconf 91'>24,</span> <span class='ocrx_word' id='word_1_655' title='bbox 1672 2695 1716 2726; x_wconf 88'>25,</span> <span class='ocrx_word' id='word_1_656' title='bbox 1728 2702 1760 2721; x_wconf 90'>or</span> <span class='ocrx_word' id='word_1_657' title='bbox 1772 2695 1806 2721; x_wconf 88'>30</span> <span class='ocrx_word' id='word_1_658' title='bbox 1817 2694 1917 2721; x_wconf 86'>frames</span> <span class='ocrx_word' id='word_1_659' title='bbox 1928 2702 1976 2727; x_wconf 89'>per</span> <span class='ocrx_word' id='word_1_660' title='bbox 1987 2694 2100 2726; x_wconf 87'>second,</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_28' title="bbox 373 2731 652 2765">
+    <p class='ocr_par' id='par_1_36' lang='eng' title="bbox 373 2731 652 2765">
+     <span class='ocr_line' id='line_1_74' title="bbox 373 2731 652 2765; baseline 0 -7; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_661' title='bbox 373 2731 449 2764; x_wconf 87'>(even</span> <span class='ocrx_word' id='word_1_662' title='bbox 460 2731 529 2765; x_wconf 88'>drop</span> <span class='ocrx_word' id='word_1_663' title='bbox 541 2731 652 2764; x_wconf 81'>frame!)</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_29' title="bbox 347 2777 2174 2811">
+    <p class='ocr_par' id='par_1_37' lang='eng' title="bbox 347 2777 2174 2811">
+     <span class='ocr_line' id='line_1_75' title="bbox 347 2777 2174 2811; baseline 0.001 -8; x_size 33; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_664' title='bbox 347 2782 360 2796; x_wconf 72'><strong>0</strong></span> <span class='ocrx_word' id='word_1_665' title='bbox 372 2777 504 2804; x_wconf 82'>TEMPO</span> <span class='ocrx_word' id='word_1_666' title='bbox 515 2785 578 2810; x_wconf 91'>may</span> <span class='ocrx_word' id='word_1_667' title='bbox 588 2777 622 2804; x_wconf 92'>be</span> <span class='ocrx_word' id='word_1_668' title='bbox 633 2778 741 2804; x_wconf 84'>entered</span> <span class='ocrx_word' id='word_1_669' title='bbox 751 2777 934 2811; x_wconf 80'>numerically,</span> <span class='ocrx_word' id='word_1_670' title='bbox 946 2777 1101 2811; x_wconf 85'>adjustable</span> <span class='ocrx_word' id='word_1_671' title='bbox 1111 2777 1139 2804; x_wconf 92'>in</span> <span class='ocrx_word' id='word_1_672' title='bbox 1149 2778 1239 2805; x_wconf 88'>tenths</span> <span class='ocrx_word' id='word_1_673' title='bbox 1250 2778 1282 2805; x_wconf 85'>of</span> <span class='ocrx_word' id='word_1_674' title='bbox 1290 2786 1307 2805; x_wconf 94'>a</span> <span class='ocrx_word' id='word_1_675' title='bbox 1317 2777 1567 2805; x_wconf 85'>Beat-Per-Minute</span> <span class='ocrx_word' id='word_1_676' title='bbox 1577 2777 1748 2809; x_wconf 85'>increments,</span> <span class='ocrx_word' id='word_1_677' title='bbox 1760 2785 1792 2804; x_wconf 87'>or</span> <span class='ocrx_word' id='word_1_678' title='bbox 1803 2777 1839 2810; x_wconf 94'>by</span> <span class='ocrx_word' id='word_1_679' title='bbox 1849 2777 1964 2811; x_wconf 84'>tapping</span> <span class='ocrx_word' id='word_1_680' title='bbox 1975 2781 2086 2810; x_wconf 85'>quarter</span> <span class='ocrx_word' id='word_1_681' title='bbox 2097 2781 2174 2804; x_wconf 85'>notes</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_30' title="bbox 372 2815 808 2842">
+    <p class='ocr_par' id='par_1_38' lang='eng' title="bbox 372 2815 808 2842">
+     <span class='ocr_line' id='line_1_76' title="bbox 372 2815 808 2842; baseline 0.002 -1; x_size 32.351353; x_descenders 5.3513513; x_ascenders 9"><span class='ocrx_word' id='word_1_682' title='bbox 372 2822 410 2841; x_wconf 93'>on</span> <span class='ocrx_word' id='word_1_683' title='bbox 420 2815 466 2842; x_wconf 86'>the</span> <span class='ocrx_word' id='word_1_684' title='bbox 476 2815 545 2841; x_wconf 91'>TAP</span> <span class='ocrx_word' id='word_1_685' title='bbox 556 2815 689 2842; x_wconf 85'>TEMPO</span> <span class='ocrx_word' id='word_1_686' title='bbox 699 2815 808 2842; x_wconf 83'>button.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_31' title="bbox 347 2861 1792 2940">
+    <p class='ocr_par' id='par_1_39' lang='eng' title="bbox 347 2861 1792 2940">
+     <span class='ocr_line' id='line_1_77' title="bbox 347 2861 1792 2895; baseline 0.001 -8; x_size 33; x_descenders 6; x_ascenders 8"><span class='ocrx_word' id='word_1_687' title='bbox 347 2866 360 2880; x_wconf 68'><strong>0</strong></span> <span class='ocrx_word' id='word_1_688' title='bbox 372 2861 504 2887; x_wconf 87'>TEMPO</span> <span class='ocrx_word' id='word_1_689' title='bbox 515 2861 696 2888; x_wconf 86'>CHANGES</span> <span class='ocrx_word' id='word_1_690' title='bbox 707 2869 771 2894; x_wconf 92'>may</span> <span class='ocrx_word' id='word_1_691' title='bbox 781 2861 815 2888; x_wconf 92'>be</span> <span class='ocrx_word' id='word_1_692' title='bbox 825 2861 1019 2894; x_wconf 85'>programmed</span> <span class='ocrx_word' id='word_1_693' title='bbox 1030 2861 1087 2888; x_wconf 88'>into</span> <span class='ocrx_word' id='word_1_694' title='bbox 1099 2869 1115 2888; x_wconf 87'>a</span> <span class='ocrx_word' id='word_1_695' title='bbox 1126 2870 1268 2895; x_wconf 87'>sequence,</span> <span class='ocrx_word' id='word_1_696' title='bbox 1280 2861 1344 2888; x_wconf 89'>with</span> <span class='ocrx_word' id='word_1_697' title='bbox 1356 2862 1467 2888; x_wconf 88'>smooth</span> <span class='ocrx_word' id='word_1_698' title='bbox 1478 2861 1635 2888; x_wconf 85'>transitions</span> <span class='ocrx_word' id='word_1_699' title='bbox 1646 2861 1670 2887; x_wconf 90'>if</span> <span class='ocrx_word' id='word_1_700' title='bbox 1679 2861 1792 2888; x_wconf 89'>desired.</span> 
+     </span>
+     <span class='ocr_line' id='line_1_78' title="bbox 347 2906 1507 2940; baseline 0.002 -8; x_size 33; x_descenders 7; x_ascenders 8"><span class='ocrx_word' id='word_1_701' title='bbox 347 2911 360 2925; x_wconf 74'><strong><em>°</em></strong></span> <span class='ocrx_word' id='word_1_702' title='bbox 371 2906 434 2938; x_wconf 92'>Any</span> <span class='ocrx_word' id='word_1_703' title='bbox 444 2906 539 2932; x_wconf 85'>TIME</span> <span class='ocrx_word' id='word_1_704' title='bbox 550 2906 763 2933; x_wconf 88'>SIGNATURE</span> <span class='ocrx_word' id='word_1_705' title='bbox 773 2915 836 2939; x_wconf 88'>may</span> <span class='ocrx_word' id='word_1_706' title='bbox 846 2907 880 2933; x_wconf 91'>be</span> <span class='ocrx_word' id='word_1_707' title='bbox 891 2907 968 2938; x_wconf 89'>used,</span> <span class='ocrx_word' id='word_1_708' title='bbox 980 2907 1036 2934; x_wconf 89'>and</span> <span class='ocrx_word' id='word_1_709' title='bbox 1046 2915 1109 2940; x_wconf 91'>may</span> <span class='ocrx_word' id='word_1_710' title='bbox 1120 2907 1154 2934; x_wconf 90'>be</span> <span class='ocrx_word' id='word_1_711' title='bbox 1164 2907 1288 2940; x_wconf 84'>changed</span> <span class='ocrx_word' id='word_1_712' title='bbox 1299 2907 1393 2934; x_wconf 83'>within</span> <span class='ocrx_word' id='word_1_713' title='bbox 1404 2915 1420 2934; x_wconf 89'>a</span> <span class='ocrx_word' id='word_1_714' title='bbox 1431 2915 1507 2940; x_wconf 87'>song.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_32' title="bbox 1540 2970 1878 3140">
+    <p class='ocr_par' id='par_1_40' lang='eng' title="bbox 1540 2970 1878 3140">
+     <span class='ocr_line' id='line_1_79' title="bbox 1540 2970 1800 3089; baseline 0 -14; x_size 100.5; x_descenders 16.5; x_ascenders 28.499998"><span class='ocrx_word' id='word_1_715' title='bbox 1540 2970 1800 3089; x_wconf 74'>E1111</span> 
+     </span>
+     <span class='ocr_line' id='line_1_80' title="bbox 1554 3108 1878 3140; baseline 0 -5; x_size 32; x_descenders 5; x_ascenders 9"><span class='ocrx_word' id='word_1_716' title='bbox 1554 3108 1624 3135; x_wconf 91'>Linn</span> <span class='ocrx_word' id='word_1_717' title='bbox 1635 3108 1808 3140; x_wconf 87'>Electronics,</span> <span class='ocrx_word' id='word_1_718' title='bbox 1822 3109 1878 3136; x_wconf 84'>Inc.</span> 
+     </span>
+    </p>
+   </div>
+   <div class='ocr_carea' id='block_1_33' title="bbox 1554 3150 2188 3226">
+    <p class='ocr_par' id='par_1_41' lang='eng' title="bbox 1554 3150 2188 3226">
+     <span class='ocr_line' id='line_1_81' title="bbox 1557 3150 2163 3182; baseline 0 -5; x_size 32; x_descenders 5; x_ascenders 8"><span class='ocrx_word' id='word_1_719' title='bbox 1557 3150 1638 3177; x_wconf 88'>18720</span> <span class='ocrx_word' id='word_1_720' title='bbox 1648 3150 1761 3177; x_wconf 89'>Oxnard</span> <span class='ocrx_word' id='word_1_721' title='bbox 1772 3150 1866 3182; x_wconf 81'>Street,</span> <span class='ocrx_word' id='word_1_722' title='bbox 1878 3150 2006 3182; x_wconf 86'>Tarzana,</span> <span class='ocrx_word' id='word_1_723' title='bbox 2019 3150 2071 3177; x_wconf 93'>CA</span> <span class='ocrx_word' id='word_1_724' title='bbox 2082 3150 2163 3177; x_wconf 88'>91356</span> 
+     </span>
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+</html>